On the other hand, when men want to build their biceps and triceps, it is natural, that more focus will be on upper body exercises, for biceps, triceps and chest. If you want to build strength in the legs, then leg exercises will have to be focused upon. This is true of athletes, who have to concentrate on strength in the legs along with stamina. If your fitness goal is stamina, then exercises focusing on stamina will help in reaching the goal.