After you activate your core, all other exercises also become core exercises, Yang said. In low plank, you keep undue tension out of your shoulders, and still reap all the benefits of high plank. For proper form, keep your forearms on the ground in a straight line out from the elbows. Elbows should be underneath your shoulders and palms should be facing down to help pull shoulders into proper alignment. Focus on pressing the middle of your shoulders high to the sky or ceiling to make your upper back as flat as possible, and look forward to keep your cervical spine active. From the top of your head to your heels, you should create a straight line. To make sure you’re working your whole body, squeeze your butt as hard as you can and pull your naval in.