I admit I only watched part of the video before I submitted it, but unless I'm mistaken the pool is actually part of this, I don't think they designed it as a retrofit (which is probably actually smart of them, from a liability standpoint).
We had a similar thing on the swim team in high school (1996/7). You'd dive in on one end of the lane, and then test the speed / strength of your stroke against the rubber bands connected to the wall.