3. RKC Plank
“Many people can hold planks for minutes and minutes but try an RKC plank and you will see that not all planks are created equal,” warns Tamir.
How to do it: Get in a standard forearm plank with your hands clasped in front of you. Firm up your whole body, driving your elbows towards your hips and pulling your toes towards your hips. “Your heart rate will shoot up and all the muscles in your body will light up,” says Tamir.
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