10 minutes, one exercise, what could go wrong?

Sometimes you work you way through the weekly workouts and you just want to focus on a single exercise.  Maybe you only have 10 minutes and you want to make it count.  Here is a great way to use that time.  The heart rate doesn't go high like some other things we do at thedailyfit.net but it will leave your legs quivering (if that's what you're looking for)

(1) pick a single exercise (my example is the squat)
(2) grab a pair of dumbbells that are basically hard for you (unless you're doing something like a pushup, then dumbbells are kinda silly)
(3) perform that movement 10 times in rapid succession
(4) immediately drop the weight to the ground (if weight is involved)
(5) immediately perform the same movement 10 more times using a 3/3 count (3 seconds down, 3 seconds up, no pause)
(6) repeat this every 2 minutes for 5 rounds.

Here is how I would normally write it out:

every 2 minutes for 5 total rounds do the following:
10 dumbbell squat 2x40#
10 slow squat (dry) using 3/3 count
rest remainder of 2 minutes.