He should work out; so he can loose weight and burn calories, but gain muscle mass at the same time
That statement is true
Aerobic exercises refers to the type of exercise that force your cardiovascular system to put more intense work compared to your usual state. This type of exercise is really good to prevent heart related diseases, massively increase your stamina, and tend to burn the most calories compared to other type of exercies.
It is the last question because waking doesn’t help build muscle it will make you burn calories but you need to work out certain parts of the body to build muscle not by waking.
