Lie on your back on the floor, bend your knees, and set your feet on the floor. Allow your arms to rest on the floor alongside your body. Exhale and press your feet and your arms into the floor. Push your tailbone up, firm your buttocks, and lift them off the floor, keeping your thighs and feet parallel to one another and your knees directly over your heels. Don't clench your buttocks, but rather, think of lengthening your tailbone toward the backs of your knees.
