This is the staple Pilates exercise I use to build endurance in my core

How to do Pilates hundreds, and the variations to try ...

This 'body saw' abs exercise is better than sit-ups in every way, according to research

Sit-ups are terrible for your back.

No sit-ups, crunches, or planks — this is the staple Pilates exercise I use to build endurance in my core

Exhale and curl your head, neck, and shoulders off the floor. Reach your arms by your side and hover them a few inches off ...