Hang the rings over your head and hang from them with a prone grip. Raise your knees to your chest and get your torso parallel to the ground. From that position, pull without flexing your arms until you hang upside down, with your head facing the ground. From there, return to the initial position without bending your arms.
shoulders, chest, triceps
triceps, chest, shoulders, core
legs, buttocks, calves, femoral, quadriceps