go running, do many sports that make you work hard, go to the gym, have a healthy diet. Lift weights, but don't go overboard as weights that are really heavy may stunt your growth if you're still growing.
excerice
no
The lower the weights, the stronger and leaner your muscles will become with more repetitions. If you want bigger muscles, you should try heavier weights.
The gymnast have more muscles but the foot ball player has bigger muscles.
Lift weights with them
poseidon
milk
i don no
bigger muscles
contacting and retracting. actually they are also breaking slightly when you exercise, that way, when they heal the heal bigger and better. (hence, bigger muscles)
Chicken
get bigger muscles