Pier one Lie flat on the bed with both hands placed flat side of the torso, and then lift the hips up, bend the knees.Hold down for 3 seconds, and then place the original timetable, repeat 10 times.
One position lying flat on the bed. Both flat sides. Then lift the hips up Bend your knees and hold for three seconds, then put the pin back in, repeat 10 times.