They also do well. The mechanics of this process can be described as the body, given calories defecit, will start optimizing energe consumption and will start '

They also do well. The mechanics of this process can be described as the body, given calories defecit, will start optimizing energe consumption and will start 'turning off' big consumers (muscles). In general you just need to use your body muscles in two directions - endurance and strength. Two because we have two (simplified statement) types of fibers, strength and endurance. Good example of body weight excercises could be calisthenics. edit: improved example