Doing a plank with improper form (the saggy plank) is the most common core training mistake. It gets in the way of spinal stability and a strong deep core.
The hips sag to the floor, the low back is fully arched, knees are bent, shoulders are up by the ears, and the head is tilted up.
That is why it is very important to do this exercise in a proper way. See how…
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