Take a pronated grip on the rings, start from an active hang, with knees bent. Try to keep the arms straight and use your lats to pull, tuck your knees in to your chest, and keep pulling until your inverted. Keep going, slowly lowering into a tucked back lever position. Lower with control and try to find the horizontal position with your body. Pause before pulling your legs back through to the start. Potract the scapula as you pull out of the backlever tuck and try maintain straight arms.
Repeat for repetitions.