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

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." When you think of Copenhagen, smoked fish and bike lanes might come to mind. But in the fitness world, it ...

Get your stopwatch out.

(CNN) — Planks are widely considered by fitness experts to be a fantastic exercise to strengthen the muscles in your core and elsewhere, no matter your age or physical fitness level. There are ...

Love ‘em or hate ‘em, planks are a popular fitness move for a reason: they’re effective. This one move engages the entire body, especially the abs. Planks put the entire core muscle group to work, ...

Planks are a simple, equipment-free exercise that strengthen your core, improve posture, and protect your back ...

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

If you’ve ever tried them, you know side planks are challenging­—even more than regular planks. But they’re a critical move, says Keli Roberts, an exercise physiologist with the American College of ...

Pilates pro Simone de la Rue demonstrates how to do a plank jack—aka the ultimate cardio and core-strengthening move—with proper form. A little known fact about planks: In addition to working nearly ...