Box Hip Flexor
On a mat kneel with the left leg at a 45 degree angle from a 12 inch box. Rotate the hips; place the right foot on the box. Flex the glutes, tighten the abs and reach for the ceiling with the left hand.
Do not over arch the back. Repeat on the opposite side.
If unable to balance on the 12 inch box reduce the height of the box.
Hold for 20 to 30 seconds. Repeat on the opposite side.