If you are looking for a real challenge, then try doing the RKC Plank. Invented by a former Soviet special forces trainer, Pavel Tsatsouline, the Russian Kettlebell Challenge or RKC plank is a ...

Planks can help work your core muscles, as well as your upper and lower body. There are different types of planks that may have slightly different benefits. The plank is a classic exercise that works ...

Ask a bunch of trainers to give a short list of their favorite exercises, and the plank will likely top many of them. And for good reason: While you probably pencil the plank into your routine to work ...

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