This week: low planks. You probably didn’t think planks could harder than the five-minute-hold challenge. But for a deeper (and arguably more useful) burn, try taking the plank into a low position.

The commando plank — moving from high to low plank and back again — is a shoulder and core exercise I love to program, but I ...

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However, if your goal is to strengthen the entirety of your core and work the smaller muscles to support you in big lifts, you might want to consider other variations of a plank. Lie on your right ...