While maintaining a neutral pelvic position, gently lift your hips off the floor until hip joint is straight. (mindbodygreen.com)
Press the lower back into the floor, engaging the core and lift the hips off the floor reaching the legs towards the ceiling. (fitwirr.com)
With your top foot stacked on top of your bottom foot, lift your hips off the floor so that your shoulders, hips, knees, and feet are in a straight line. (getfitfiona.com)