Just 4 Exercises and 9 Minutes was all it took

Today's simple workout took advantage of a couple of compound movements to offer a full-body workout in surprisingly little time.

Here are the four moves, each done for 18 seconds followed by 27 seconds of rest before the next move, with the entire set repeated two more times.

--Chin-ups with knee-ups
--Front Barbell Squats followed by overhead-press
--Push-ups
--Ab-wheel roll-outs.

The hardest part is chin-up move by the time you get to the third set.