Of course, exercise is brutal! Working on a 75% complete muscular structure including your shoulders, traps, back, Buttocks, no, hams, calf, abs and many other synergistic muscles in one exercise, is that it assumes that tax your strength, endurance and your cardio health? Not the best exercise? Is not that why the results of the squats are awesome? As an added bonus to building large muscles, you burn fat like crazy since the squat, taking into account the intensity brought to their body their metabolism zooms up! If your body proportion of fat is high, help you lose body fat by some Force Factor.