"Body weight" refers to the amount of weight or mass that a person's body carries. It represents the total measurement of a person's bones, organs, muscles, and everything else that makes up their physical body. Full definition
As an example, if you include 3 ounces of beef in just four meals per week, you consume enough calories to gain 1 pound of body weight in about a month. (healthyeating.sfgate.com)
In terms of body weight exercises not being used for muscle growth, now we both know thats not true right? (ashotofadrenaline.net)
Divide 16 grams by 10 pounds and you see that your cat is eating 1.6 grams of protein per pound of healthy body weight per day. (fearfreehappyhomes.com)