I’ve never enjoyed doing sit-ups. From doing them on the cold, hard gym floor at school to tediously tagging them onto the end of another workout, they’ve always felt uncomfortable on my lower back ...

The Bottom Line: Ditch the sit-ups. These bodyweight exercises are smarter, tougher, and deliver more bang for your buck.

You can do these moves “anywhere” and “at any time,” Austin explained.

Cat-cow is a gentle spine mobilizer, stretching the front body and mid to upper back. Add some free movement if you want to ...

To help her clients build muscle, strengthen their core and burn fat (she has also trained Halle Berry, Scarlett Johansson, ...