You can become more muscular in many ways. Here are a few:
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You build it through continued, repetitive use.
Push ups and pull ups.
By exercising your body and by eating proteins.
muscle gain
When you do your work out , you do not gain weight , your body uses it to build muscles.
mass xxx to gain weight and build muscle
Muscle and fat are two different things, simple if eat and do nothing you gain fat not muscle, if the muscle becomes inactive you will lose muscle. Muscle growth comes when the muscle get stimulated or understress they grow in order to compensate for the stress they are under. but the body needs the proper diet to make the muscle to grow as well. http://cal muscle building tips is a good source.
Lifting weights will make your muscles contrast and burn fat from your body while strengthening the muscles at the same time. It will help you gain muscle.
Its best to take once in the morning and after training, to optimise muscle weight gain.
Your body cannot use all energy sources from fat reserves it just cannot happen! When you bulk you gain fat, when you decrease calories you lose fat and small amounts of muscle
what muscles of a weight lifter/marathon/runner/compared
Generally you will gain about 2 pounds of muscle a month when body building when you are a strict beginner and working really hard at eating proper. If you are gaining much more then that I would be concerned that it isn't all muscle gain.