For time:
5 rounds with a 3 minute rest between each round

20 pull ups
30 push ups
40 sit ups
50 air squats

I did this last night at home since I'm still trying to get over this horrendous upper respiratory infection and figured my wheezing and hacking isn't box friendly. Time could have been better, but pull-ups took longer on the last two rounds as I worked the neg to improve.