That said lets test ourselves to failure today. (Yes, I know, It's Mothers Day - A sneaky little 15 minutes or so is perfectly acceptable if you are the warrior that your family all believe you are.)
Press ups ( 3 sets back to back) - Standard wide arms, military (narrow arms at sides), inverted (feet raised).
Sit ups (3 sets back to back) - Reverse crunch, Russian twist, full sit-up with double punch.
Chins (3 sets back to back) - Wide overhand, narrow overhand, narrow underhand
Repeat 5 times.
Perform each exercise until your body fails, move immediately onto the next exercise and, again do to failure (you will probably not be able to do many by the 2nd and 3rd exercise).
Tough...I lasted 17 minutes - which my wife will tell you is a long time for me ;@)
How long can you last??