Quads, Hamstrings, Glutes. Those are the usual muscle groups that come to mind you think of your leg day. But if you’re only training those muscle groups, you may not be working through a complete leg workout. Don’t forget your calves. They’re easy to forget about in the gym, especially on serious leg days, because squats and other leg lifts will leave you tapped. But your calves are also a visual temperature gauge for how closely you’re paying attention to your leg training.