You’ll have read or heard the instruction a thousand times, but how do you actually engage your core and what does it look like in practice? That’s something certified yoga teacher Leanne Lent from ...

"You have to engage your core." There's an ongoing joke in my house that working your core will fix just about any issue. As a former Pilates instructor, this is my go-to fix-it line. Back pain?

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. When we lift weights, ...