A smarter, spine-friendly abs exercise is gaining attention among coaches and fitness experts.

Do you need to strengthen your core? If you've ever had a baby, if you spend a lot of time sitting, if you have pain or soreness, if you have a fitness goal or want to move safely and efficiently ...

When I first started running, I thought that a solid core workout involved blasting through some crunches and sit-ups, then checking for any signs of visible ab definition. It turns out that I had ...