HOW: Start by lying on your back near a wall. Place both feet flat up against the wall. Find 90 degrees bend at the knees and the hips. The low back is flat against the floor. Tilt the pelvis posteriorly, or towards the top of your head. Can imagine the belly button looking up towards the head, or tucking the tail underneath the body. Can use feet for assistance. Repeat for duration or reps.
FEEL: Will feel lower abdominals working. Can feel low back stretch.
COMPENSATION: Avoid lifting the hips off the ground. Avoid lifting the low back from the ground when untucking the pelvis.