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 ...

A fitness expert has revealed how long you should be able to hold a plank for, based on your age. A plank exercise is when you hold your body in a push up position, in a straight line, like a plank of ...

Spoiler alert: There is <a href="https://www.womenshealthmag.com/fitness/a19909906/what-it-takes-to-get-a-six-pack/" id="8cce8813-8264-31a7-acbf-afc9c065e83e"> no ...

Planks and jumping jacks are perfectly fine workout moves. But if you combine the two together, you can actually get an even better total-body workout. Meet: the plank jack! Plank jacks involve ...

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 ...

Burpees are a popular exercise, but they can put a lot of stress on your joints. You can swap burpees for other lower-impact ...

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

When I heard the record for a woman holding an abdominal plank was measured in hours and not minutes (a whopping 4 hours 19 minutes and 55 seconds), I honestly couldn't believe it. I get the full-body ...