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.

If you cannot lie down on your back, you’re short on space, or you simply prefer standing workouts, this 15-minute ab workout blasts your core without a single sit-up.

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 ...

However, you can stay standing and still get a quality core workout done, as this 10-minute dumbbell abs workout shows ... There are eight exercises in the workout and you do two sets of each ...