Arm day, leg day… foot day? When you’re working up a sweat, your feet likely get less attention than larger muscle groups (we’re looking at you, core workouts!), but when you have flat feet—which, ...

Beth Skwarecki is Lifehacker’s Senior Health Editor, and holds certifications as a personal trainer and weightlifting coach. She has been writing about health for over 10 years. It’s easy to exercise ...