This week: lateral lunge. If you want to run comfortably, then you need to have a strong base – and that means working those leg muscles. It’s not just the glutes and quads you need to worry ...

If your leg day routines lack single-leg exercises, it's time to reconsider, as trainer and physical therapist John Rusin, D.P.T., shared in an Instagram post. Rusin is a fitness coach and injury ...