How to Build Muscle (for Kids)

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1 Building Muscles Safely

2 Beginning Weightlifting

3 Understanding Kids’ Muscles

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Article Summary

Co-authored by Tiffany Jumaily, MD

Last Updated: October 7, 2024 Fact Checked

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Kids want to get strong for a variety of reasons, from looking like their favorite superhero to being better at their chosen sport. While kids cannot lift weights until they hit puberty, there are a variety of activities kids can do to build muscle and get stronger.

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Method 1

Method 1 of 3:

Building Muscles Safely

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1. 1
   Go outside and play. Running, biking, swimming, playing sports, and walking around the woods all build muscles naturally, and this is often the safest, most fun way for kids to build muscles. Grab a group of friends and play a game of basketball, start a scavenger hunt, jump in the pool, and wrestle in the backyard – just like many adults “cross-train” to build muscle with different activities, kids can secretly build muscles while playing.
2. 2
   Warm up before exercising. Just because kids are flexible and full of energy doesn’t mean they can skip the warm-up. Do 5-10 minutes of light aerobic activity, like walking, jogging, or jumping rope, before working out to get your muscles loose and your blood flowing.
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3. 3
   Use the weight of your body to build muscle anywhere. Kids should not just take an adult’s workout plan and scale it down. Not only can this be dangerous, kids have an energy level and natural flexibility that allows them to do a variety of exercises without needed weights. Perhaps more importantly, these exercises are easily turned into games or small competitions, making them much more fun to get through then a trip to the gym.

   • Hops, skips, and lunges all use your body weight to train your leg muscles.
   • Climbing, whether at a rock wall on the playground, is a great workout for your arm and leg muscles.
   • Traverse monkey bars to do modified "pull-ups," or offer to push your friends on the swings to build arm muscle.
   • You can also wear a weighted workout belt to increase the difficulty of your exercises. However, check with an adult first to make sure you’re using the right amount of weight for your body—too much weight can hurt or damage your muscles (which is the opposite of what you're trying to do!).
   • Reader Poll: We asked 284 wikiHow readers and 51% of them agreed that the best exercise for building arm strength is weighted pull-ups. [Take Poll]
4. 4
   Do push-ups. One of the best exercises for upper body muscles is still one of the simplest. Lie on the ground with your hands and toes touching the floor. Push your entire body up with both hands until your elbows are barely bent, then lower yourself slowly down towards the ground. When you are about 6 inches from the floor, push up again and repeat. Try to get 10 in a row, then rest for 1-2 minutes and try again.

   • Keep your butt down, even with your shoulders.
   • Keep your back straight.
   • Your hands should be shoulder-width apart. However, the further apart they get the more you work out your chest muscles. The closer together your hands are the more you’ll work your arm muscles.
5. 5
   Do sit-ups with a ball and a friend. Sit across your friend with your knees bent and your toes facing each other. One of you should have a ball in your hands. At the same time, bend up from your stomach so that you are looking each other in the eyes and pass the ball. Only your feet and butt should still be touching the ground. Keep doing sit-ups and passing the ball until one of you is too tired to continue.

   • Keep your feet on the ground the entire time, and try to keep your shoulders lined up with your partner's.
   • Focus on using the muscles around your stomach, your abs, to pull you up each time.
6. 6
   Organize “crazy races” to build different muscles. There are tons of fun variations to a normal race that activate certain muscles and encourage kids to exercise without knowing it. Try making a relay race that switches between the following exercises to encourage great upper body strength.

   • Bear crawl: With your hands and feet on the ground, stick your butt high in the air and run forward on all fours. You’ll be surprised how quickly you get tired – many football and rugby teams still do this for strength conditioning.
   • Crab walk: Sit on the floor with your knees bent and your feet and hands on the ground. Lift your butt and walk forward, backward, or side to side to exercise your arms, abs, and thighs.
   • Burpee: Jump forward with both feet. When you land, get down and do one push-up. Then get up quickly and leap forward again.
   • Moon lunges: While they look slow, these are great hip and leg building exercises. Take the biggest step forward you can with your right foot, then lower your left knee and your butt slowly towards the ground. Stand up and repeat with your left leg.
7. 7
   Spell out your alphabet with your legs. This helps to work your core and leg muscles. This exercise isn’t for the faint of heart, but it is a fun way to work some thinking and competition into your exercises. Lay on your back. Lift both legs together and point your toes down so that they form a long, straight pencil. From here, spell out the alphabet with your legs. How far can you get?

   • It is often easiest to keep your hands underneath your butt for balance.
   • Make a “Work-out Spelling Bee” by challenging friends to spell words with your legs. Not only does spelling count, but you have to get through the word as well.
8. 8
   Use resistance bands for “light” weight training. Resistance bands are a long, stretchy, exercise tools that allow you to safely simulate weightlifting. Imagine them as large rubber bands—as you pull on them, they resist you and want to snap back together, making them harder and harder to pull on. Some exercises to try include:

   • Stand on one end of the band with your right foot and hold the other in your right hand. Keep your elbow in the same place and pull the band up towards your chest with your hand. Do ten, then switch hands.
   • Hold an end of the band in each hand. Stand on the center of the band with both feet, legs shoulder-width apart. With your arms wide apart (like you were surrendering), push the ends of the band up to the sky. Keep your knees slightly bent.
   • Hold an end of the band in your right hand and step on the other end with your left foot. Keeping your back straight, twist at the hips towards you left foot as if you were trying to touch your toes with your right hand. Twist back out and pull the band high up to the right side of your body. Think of doing a classic “disco dance,” or pulling the cord to start a lawnmower.
9. 9
   Stretch when you are done. Cooling down helps you muscles relax, making them more effective the next time you need them. Do some light stretching when you are finished to feel great the next day.

   • Make sure you take time to rest. Your body needs time recover after a workout, so don’t exercise the same muscles two days in a row.
10. 10
    Know that you should not lift weights until after puberty. Trying to lift difficult weights and “get huge” is not only impossible for young kids, it is unhealthy. Your muscles, tendons (which attach muscles to bones) and ligaments (which attach bones to other bones) are not fully developed, and could tear under the stress. Be patient and wait on weights until you are a teenager.

    • Small weights, ranging from 1-5lbs, can be safely substituted for resistance bands in younger children.
    • Body weight exercises are much better for younger kids. You can still build muscle without injuring yourself.
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Method 2

Method 2 of 3:

Beginning Weightlifting

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1. 1
   Start lifting after you’ve hit puberty to build muscle. Teenagers can start to build muscle in the gym after puberty. In fact, teenagers may be able to build muscle faster than adults. The hormones that cause a teenager to grow rapidly in puberty increase your metabolism and increase muscle growth. Most children can start lifting weights at age 12-14, but the signs that someone is going through puberty include:

   • Beginning body odor
   • Acne
   • Beginning to grow body hair (males)
   • Shoulders widening, chest growing (males)
   • Begin to develop breasts (females)
   EXPERT TIP

   

   Laila Ajani

   Fitness Trainer

   Laila Ajani is a Fitness Trainer and founder of Push Personal Fitness, a personal training organization based in the San Francisco Bay Area. With over 13 years as a trainer and exercise specialist, Laila has expertise in competitive athletics (gymnastics, powerlifting, and tennis), personal training, distance running, and Olympic lifting. Laila is certified by the National Strength & Conditioning Association (NSCA), and USA Powerlifting (USAPL), and she is a Corrective Exercise Specialist (CES).

   

   Laila Ajani
   Fitness Trainer

   Children should not focus excessively on muscle building before they reach puberty. When exercising with kids, parents should not worry about doing a set amount of exercise or reps in a workout session. Instead, they should focus on introducing fun activities that make kids excited about fitness and about starting this healthy habit at an early age.
2. 2
   Focus on light weights with lots of reps, not lifting a ton of weights a few times. The safest, most effective way for teens to gain muscles is to have proper form and safe lifting habits. As you first start out, you might be able to bench press a lot of weights once or twice, but your form will suffer as you try to force the weight up. Try to do 8-12 reps of something with a weight that challenges you but feels comfortable.

   • A “rep” is when you do an exercise once. Aim for 8-12 reps
   • A “set” is a collection of reps. After one set, rest for 1-2 minutes before continuing. Aim for 3-5 sets of each exercise.
3. 3
   Build a program around the basics. While every magazine rack in the country touts “the best new workouts to gain muscle,” the classic exercises are still some of the best. Most of these are “compound lifts,” meaning they work out multiple muscles at once for quick results. Start your lifting program by learning the following exercises before moving on to more complex, sport-specific lifts:

   • Bench Press
   • Shoulder Press
   • Squats
   • Deadlifts
   • Rows
4. 4
   Aim to work out 3-5 days a week for no more than an hour each day. Remember, your body is still growing and will react negatively to working out too often. Don’t push yourself thinking you will get better results – you may only hurt yourself and set your training back. Shorter sessions done frequently will help maintain proper form and keep your muscles healthy.

   • Work out on non-consecutive days so that you get a rest in between each session.
   • Hour-long workouts allow you to focus on your technique without getting too tired to pay attention to form.
5. 5
   Make sure your technique is perfect. This is the best thing you can do to grow muscle quickly and safely. Do not try to teach yourself how to lift, you need a coach, parent, or personal trainer to spot your mistakes and show you how to fix them. Some things to focus on include:

   • Keep your back straight. Your lower back should never bend while lifting weights. To avoid it, focus on keeping your chest puffed slightly up and your shoulder blades back.
   • Never fully extend your joints. Instead, push the lift until your joint is just slightly bent before returning to rest position.
   • If you feel pain, stop. "No pain, no gain" is a myth -- while an exercise should be difficult, sharp pain in your muscles or joints means you are doing something incorrectly.
6. 6
   Eat and drink water within 30 minutes of exercising to fuel muscle growth. Your muscles need protein and energy to grow strong, so make sure you get the calories you need to build muscle. While you don’t need to overload on protein, try to get some in your system shortly after a workout. Make sure you drink 2-3 glasses of water after working out to re-hydrate as well. Good foods for muscular gain after a workout include the following:

   • Turkey or chicken sandwich
   • Trail mix
   • Peanut butter and jelly
   • Protein, granola, or fruit & nut bars.
7. 7
   Know that supplements are not a substitute for good nutrition. Supplements claiming that they can “build muscle fast” or help you lose weight in weeks are generally not safe, especially for teenagers with developing bodies. You should focus on eating a healthy, balanced diet and refrain from “quick fixes” that may or may not work.

   • A good, balanced diet mixes in protein (chicken, fish, eggs), complex carbs (oatmeal, sweet potatoes, beans, whole wheat) and fruits and vegetables every day. A good diet will fuel your body and help you make the most of your workouts.
   • Never use steroids to supplement your workout, as these "methods" of gaining muscle can create health problems for years to come.
8. 8
   See a doctor before starting any exercise program. Ask your doctor about starting an exercise program at your yearly check-up. Make sure there are no medical concerns you should know about and talk to them about developing a safe exercise program for your body. While you may feel ready to pump some iron, your doctor will have specific advice to help you get the most out of your exercises.
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Method 3

Method 3 of 3:

Understanding Kids’ Muscles

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1. 1
   Remember that kids are not likely to grow muscles before puberty. The hormones needed to grow big, bulky muscles come with puberty, so do not push a child to lift weights or start training plans when they cannot even reap the rewards. Kids will start to build muscle naturally as teenagers, but kids should be focused less on growing muscles and more on being healthy.
2. 2
   Focus your energy on strength training, not weightlifting. Weightlifting, body building, and power lifting can all be very dangerous to a child’s still-developing muscles. Strength training, however, is focused on proper technique and safety instead of lifting the biggest piece of metal you can. Weightlifting as a child can damage a kid’s growth plates, which are pieces of cartilage still turning into bone, injuring a child for life.

   • Make a distinction between increasing muscle strength and “bulking up.” Talk to them about the benefits of having lean muscles such as a healthy weight, improved performance in sports, and higher self-esteem. Let them know that it is impossible to "bulk up" a lot of muscle before puberty.
3. 3
   Know that a child can start strength training around age 7 or 8. If a child can follow directions well and expresses interest in getting stronger, you can safely begin a light workout plan as early as 7 years old.

   • If a child is ready to play organized sports, they are generally ready to start a strength program.
   EXPERT TIP

   

   Laila Ajani

   Fitness Trainer

   Laila Ajani is a Fitness Trainer and founder of Push Personal Fitness, a personal training organization based in the San Francisco Bay Area. With over 13 years as a trainer and exercise specialist, Laila has expertise in competitive athletics (gymnastics, powerlifting, and tennis), personal training, distance running, and Olympic lifting. Laila is certified by the National Strength & Conditioning Association (NSCA), and USA Powerlifting (USAPL), and she is a Corrective Exercise Specialist (CES).

   

   Laila Ajani
   Fitness Trainer

   You should be at least 7 years old before visiting a gym. Even then, you should only be using extremely lightweight equipment. If you're 12 or younger, you should stick to bodyweight exercises; once you pass puberty, you can slowly start introducing weights into your exercise routines.
4. 4
   Focus your energy on strength training, not weightlifting. Weightlifting, body building, and power lifting can all be very dangerous to a child’s still-developing muscles. Strength training, however, is focused on proper technique and safety instead of lifting the biggest piece of metal you can. Weightlifting as a child can damage a kid’s growth plates, which are pieces of cartilage still turning into bone, injuring a child for life.

   • Make a distinction between increasing muscle strength and “bulking up” with your child by talking to them about the benefits of having lean, strong muscles, such as a healthy weight, improved performance in sports, and higher self-esteem.</ref>
5. 5
   Prioritize proper technique over big muscles. Since most children cannot actually build muscle, you should work on the proper exercise techniques to prevent injury, learn good mechanics, and set a good foundation for later workouts. Some things to look out for include:

   • Keeping your back (spine) aligned. Your lower back should never bend forward or backward to make a stretch easier. Focus on keeping your chest up and shoulder blades back so your back is flat.
   • Never “hyperextend” a joint. Hyperextension is when you bend a joint slightly the opposite direction as it is supposed to, like straightening your knees so much that your legs curve backward.
   • Work on healthy running form. Good runners keep their backs straight, land in the middle of their feet (not on their heels) and take medium sized, quick strides instead of long steps.
6. 6
   Supervise a child as they learn strength training. Kids are trying to learn complex motions at the same time as they build muscles, and this is difficult when they are first starting out. You need to watch kids and help them fix posture, avoid injuries, and work out effectively to avoid injuries.
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Expert Q&A

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• Question

  Is it bad to lift weights at 14?

  

  Tiffany Jumaily, MD
  Board Certified Pediatrician

  Dr. Tiffany Jumaily is a Board Certified Pediatrician and a fellow of the American Academy of Pediatrics (FAAP) based in Los Angeles, California. With over a decade of experience in the medical field, Dr. Jumaily specializes in identifying the root cause of symptoms and presenting manifestations of disease. She holds a BA in Biology from Boston University and an MD from Boston University School of Medicine. Her dedication to combining evidence-based allopathic medicine with complementary and alternative therapies has led to her being featured and cited in various platforms including U.S. News & World Report, Forbes, and CBS Los Angeles.

  

  Tiffany Jumaily, MD

  Board Certified Pediatrician

  Expert Answer

  You can safely lift weights as long as you're being supervised and not lifting too much at once. A experienced adult or fitness trainer can make sure that you use proper form and that you don't strain yourself.

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  Thank you for your feedback.
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• Question

  How many reps should a 12 year old do?

  

  Tiffany Jumaily, MD
  Board Certified Pediatrician

  Dr. Tiffany Jumaily is a Board Certified Pediatrician and a fellow of the American Academy of Pediatrics (FAAP) based in Los Angeles, California. With over a decade of experience in the medical field, Dr. Jumaily specializes in identifying the root cause of symptoms and presenting manifestations of disease. She holds a BA in Biology from Boston University and an MD from Boston University School of Medicine. Her dedication to combining evidence-based allopathic medicine with complementary and alternative therapies has led to her being featured and cited in various platforms including U.S. News & World Report, Forbes, and CBS Los Angeles.

  

  Tiffany Jumaily, MD

  Board Certified Pediatrician

  Expert Answer

  Around 10 to 15 reps should be good. Just make sure that they aren't lifting something that's too heavy for them!

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  Thank you for your feedback.
  If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow

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• Question

  When is the best time to work out?

  

  Michele Dolan
  Certified Fitness Trainer

  Michele Dolan is a Fitness Trainer based in Sidney, British Columbia. She has been a personal trainer and fitness instructor since 2002, and was certified as a Personal Trainer by the British Columbia Recreation and Parks Association (BCRPA). Michele is also a Registered Clinical Counselor, and uses her 20+ years of fitness coaching experience to help clients understand their mind-body connection. She is a Registered Clinical Counsellor (RCC) and Certified Clinical Counsellor (CCC), certified by the British Columbia Association of Clinical Counsellors and the Canadian Counselling and Psychotherapy Association. In her work, Michele uses the tools of Cognitive Behavioral Therapy, Dialectic Behavior Therapy and Cognitive Processing Therapy for Post Traumatic Stress Syndrome. She practices and teaches mindfulness and acceptance in all of her coaching work. She holds a Master’s Degree in Counselling Psychology.

  

  Michele Dolan

  Certified Fitness Trainer

  Expert Answer

  The best time to workout is when you have energy. Some people love to exercise first thing in the morning because it charges them up. Others get worn out by exercising, so they might prefer to exercise later in the afternoon.

  Thanks! We're glad this was helpful.
  Thank you for your feedback.
  If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow

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Tips

• When you are lifting weights, make sure you keep your body posture in a good position to avoid back pain.
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• Being active, going outside, and playing sports are the best ways to build muscles every day.
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• Don't eat too much junk food, because it's not healthy, and it builds fat.
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Tips from our Readers

The advice in this section is based on the lived experiences of wikiHow readers like you. If you have a helpful tip you’d like to share on wikiHow, please submit it in the field below.

• Encourage participating in sports, which builds functional strength. Tennis, swimming, and soccer, to name a few indirectly train muscles supporting speed, endurance and coordination.
• Monitor rest days to manage soreness. Growing bodies need recovery time. Let your soreness fade before working the same muscles again. Adjust activity if soreness lingers.
• Make exercises into games to boost fun and participation. Race friends in bear crawls. Challenge agility with obstacle courses. Imagination keeps kids engaged.
• If you are the paretn, lead by example, maintaining your own fitness routine. Children mimic adults. If you strength train safely, they will follow your lead.
• Focus on proper form over reps. Avoid injury and ingrain good habits by moving slowly and precisely at first. Perfect technique, increase speed later.
• Cook nutritious meals together, teaching healthy fueling. Kids who help prepare food tend to eat more vegetables and explore new ingredients.

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Warnings

• Never rush into a workout plan if your body is not ready for it. You often end up doing more harm to your body than good.
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