Nice idea, but I do take a bit of an issue with ideas like these. More often than not, they serve as a fig leaf and give the people using them a false sense of comfort and achievement.

There's a reason sports programming exists, and a certain level of intensity, planning and rotation is necessary for results.

A better thing to follow for at least a modicum of impact is http://www.7-min.com

Anyone who's done any amount of exercise worth the designation will have to do a few rounds of this to actually get into heavy breathing territory, but it's a (structured) start!