Add Yahoo as a preferred source to see more of our stories on Google. I can’t think of a better way to torch my non-existent six-pack abs than using an ab workout designed for Olympic gymnasts, ...

Ab work that won’t crush your spine ...

Let’s be honest: you’ve probably done thousands of sit-ups thinking they’d give you a stronger core. We all have. But here’s the uncomfortable truth—those endless crunches aren’t doing much for you.