Core strength goes deeper than aesthetics — it’s essential for preventing back pain and injury and improving sports performance. This beginner ab workout will get you started. Nearly every movement ...

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. While plenty of ...

Simple, equipment-free routines for beginners to build strength, flexibility and heart health at home, with safety tips and ...