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Stop wasting time doing basic ab planks

from STACK

The ab plank, in which you perform a static hold on your forearms from a push-up position, engages your anterior core muscles, specifically the abdominals and hip flexors, in order to maintain your spinal alignment and prevent your lower back from over-arching and your hips from sagging toward the floor. If you can do a basic ab plank for 30 seconds, it's time to stop boring yourself and progress to advanced planks. more

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