The 10-10-10 Times 5

10 Sit Ups

10 Push Ups

10 Air Squats

Do 5 Sets of that and you will have worked your arms, abs and butt.  The trick is to just commit to doing it.  You won't see results tomorrow, but you sure will feel the burn and the burn means you're on the right track!  Don't give up and keep going!  Here is a video on how to do Air Squats