CrossFit quote:

From physics we know that the higher we lift something, and the more it weighs, the more “work” we are performing. Work is in fact equal to the weight lifted multiplied by the height we lift the object. Work performed divided by the time to completion is equal to the average “power” expressed in the effort.

Power is exactly identical to the exercise physiologist’s “intensity”. Intensity, more than any other measurable factor, correlates to physiological response. So more work in less time, or more weight moved farther in less time, is largely a measure of an exercise’s potency. - Greg Glassman