In order to build muscle your body needs protein because it is the foundational
building block for muscle tissue. The amount you exercise and
body weight will both play a factor in how much protein your
body requires. You should consult a nutritionist or personal
trainer to determine the proper protein uptake you need but a
general rule is around half a gram of protein per pound of body
mass for average athletes. If you are serious about strength
training and workout 5 or more times a week you may want 0.6 to
0.8 grams of protein per pound of body weight.

Read more: Sports Nutrition For Athletes