The 7-minutes workout timer (tpatel.github.io)

The idea comes from this article from The New York Times http://well.blogs.nytimes.com/2013/05/09/the-scientific-7-mi....

another app for the 7-min workout is http://7minworkoutapp.com/

Very nice. Simple, straightforward, to the point.

If you included large icons for each of the exercises ( similar to http://thenounproject.com/noun/exercise/#icon-No318 ) and used large type relative to the screen size ( so that someone doing the workout didn't have be too close to the phone or tablet they are running the timer on ) you would have something even more compelling.