If you have a pair of light dumbbells, two arms and a bathroom you're in for a transformative exercise regime. The reason you need dumbbells is self-explanatory and the same should be said for the pair of arms but the bathroom needs a little more explanation. It's probably the easiest place to place a couple of dumbbells and go through the exercise routine every time you find yourself there. Smart training is all about lowering the threshold barriers by getting rid of the perceived obstacles to exercise. This is a routine you'll love and it will change you.
Extra Credit: No rest between exercises.