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You don't gain weight in order to get muscle. You overload your muscles with heavy weight training, and then eat more to fuel the muscle growth.
Depends. At first, muscle exerice tends to promote muscle development, and muscles have weight to them. But more muscles means you can burn more calories when exercising, and more burn can help with weight loss.
close to half of your body weight is composed of muscle.
Excersise to build bigger muscles.
what muscles of a weight lifter/marathon/runner/compared
weight training effects the muscles that you work with the weights, there are many routines for every muscle group.
When you do your work out , you do not gain weight , your body uses it to build muscles.
the muscles make up 40 % of the body weight
Weight training creates micro-tears in your muscle fibers. When your muscle is repaired using proteins, they have the effect of becoming "bigger".
Lift Heavy and eat healthy if you want to add muscle
Then Penishyoidscrotal muscle
makes your muscles more stronger and helps alot. but dont do more than you can handle because you coulkd pull a muscle.