Use false grip and bring the rings as close to your navel as you can. If you don't have rings, do pull-ups and dips - lots of them. Post results to comments in both cases.
Two rounds for score of:
Tabata Squats
Muscle-up for four minutes
Rest
No rest between finishing T. squats and muscle-ups. This is a 16-minute workout with rest at 8 minutes. Multiply lowest squat count for all eight intervals by the number of muscle-ups completed in four minutes for each round and post to comments. Substitute 5 pull-ups and 5 dips for each muscle-up if necessary.