The same way as for any other age group . By exercise and diet.
Preteens and young teens bodys does not produce enough hormones to allow the body to bulid big muscles.
It will come slowly as you build muscle on the rest of your body. It will come slowly as you build muscle on the rest of your body.
Generally, it is difficult for teens and pre-teens to build much muscle until after puberty has kicked in for a while. This is when your body's testosterone production increases, and you need that to build muscle. Your best bet for a strong, lean physique is to play sports, jog or run, and do a lot of push-ups, curls, shoulder lifts, shoulder extensions, and rowing actions with weight to help your muscle definition. Do not get discouraged! At first, it may not seem like you're building much muscle, but you're setting the stage for future muscle growth. In the mean time, you're keeping your body fit, lean, and strong.
muscle
It takes quite a while to build muscle from walking, but it takes only a short time to build good strong leg muscle from jogging or running.
Weight training is the best way to build extra muscle and body size.
Your tongue, as it is already the strongest muscle in your body.
They don't help build muscle, but they do increase your intake of protien which is what your body needs to build muscle.
Yes
no
yea they do
i