I’ve been doing a lot of work to strengthen my legs lately; the move that has made the biggest difference is the hamstring ...

Adding a little sliding disk under your foot make moves like lunges and planks a bajillion times harder. Try these slider disc exercises. Our editors independently select these products. Making a ...

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. For strong, powerful ...