How many rounds can you do in 20 minutes of:
10 Ring Dips
20 Air Squats
25 Double Unders
10 Ring Muscle Ups (7 for ladies)
30 Air Squats
40 Double Unders
If time permits - spend some time stretching after the workout - glute & shoulder with a ball, hamstring with band & straddle.
Extra: Work on a weakness of choice (muscle ups or pull-ups if not doing Rx+).