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

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

I don’t love planks. There I said it. Isometric exercises (or holding one position) are not my thing. I prefer other types of core exercises (hi dead bugs, bicycle crunches, inchworms, or V-ups!) over ...

Strengthen more than just your core muscles with the humble-yet-mighty plank.

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 ...