Add Yahoo as a preferred source to see more of our stories on Google. Ah, the plank. It may just be one of the most intimidating exercises. Anyone who has shook their way through one knows that the ...

If you are looking for a real challenge, then try doing the RKC Plank. Invented by a former Soviet special forces trainer, ...

We're here to help you challenge your core (you're welcome) with this plank series. It's part of our Jump-Start fitness plan, helping you move every day for two weeks. This challenge uses all sorts of ...

We all know plank position is good for us. But. Um. What if you lack the core strength needed to suck in the gut and engage the back, glutes and quad muscles — all while balancing between your toes ...

Welcome to Day 10 of the 21 Day Yoga Challenge! In this session, you'll learn a fundamental Vinyasa flow sequence, including ...

A fitness challenge can keep exercise exciting so you avoid a dreaded January plateau. (Getty Images) Once the novelty of all those New Year's resolutions wears off, the motivation to go to the gym ...

When you're doing a plank, you're (hopefully) concentrating on your form. Actually performing the exercise correctly is more challenging that just bracing your elbows on the ground and holding ...

Why one trainer calls the plank variation "no joke." ...

Welcome to Start TODAY. Sign up for our Start TODAY newsletter to receive daily inspiration sent to your inbox — and join us on Instagram! Ah, the plank. It may just be one of the most intimidating ...