Lower the rings so they are about the waist height. Grab the with your arms behind you and in a reverse grip. Have a step backwards and pike down. Imagine that this starting position is the same as how you would get if you would do the skin the cat forwards.
Start the motion by pulling back into scapula protraction, keeping the arms straight. Tuck the knees and pull them back through the rings, ending up facing the same direction but with your arms in front of you .
Repeat for repetitions. Keep the arms straight throughout.