Behold: The humble bodyweight squat. Not only will dropping it like it’s hot strengthen your quads, hamstrings, and glutes, adding squats to your regular workout routine could mean fewer knee injuries . And you’ll increase your bone mass which will help you avoid osteoporosis as you age . Plus, one study shows that increasing lower body strength can help you be a better runner . We’ve rounded up 40 variations in four different categories—bodyweight, plyometric, weighted, and equipment—for your squatting pleasure (or pain). To read more click here!