While using a TRX strap or similar, attach the straps to a pull up bar or at the top of a door. Lean back with extended legs and arms. The flatter the body is to the ground, the more challenging the movement becomes.
While keeping the arms straight, begin to raise the body to an upright position by bringing the arms above the head into a Y position.
Keep the elbows locked as the body is lowered back to the set up position. Remain slow and controlled while preventing the lower back from over extending.