This workout is short — just 10 minutes — and requires no equipment. But it packs in a lot of work. PS Fit instructor Natalie White designed it to target your abs, core, and thighs ...

You might doubt that a 10-minute abs workout can truly be effective, but give this session a try and I promise the doubts ...

Hi, and welcome, guys. We're going to do a 10 minute ab exercise. Five exercises, one minute each, and do two rounds of that. So we're going to get started with a simple crunch. Lay on your back.

Although the session only lasts 10 minutes ... it for an extended core workout, too. The routine, developed by fitness coach ...