Lie on your left side on an exercise mat. Your left forearm is flat on the mat and facing front, and your left arm is perpendicular to the mat, supporting your weight. Your right palm is placed on the mat for stabilization. Your knees are bent and your head and torso are elevated.
Using your abdominal muscles, lift your pelvis in the air, attempting to make a straight line from your right shoulder, through your right hip, and down to your knee. You'll feel your lower back muscles contracting to support the movement. Relax and return to the starting position.