A trainer with nearly 40 years of experience shares 4 beginner chair exercises that rebuild core strength after 60, no floor ...

You'll need better moves to build a functional core. Here’s how you can upgrade your workouts.

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. Do you want a strong ...