I'm a bit familiar with some of these exercises (in fact, there's a similar brochure lying on my table) and as far as I know, they may work. It's not exactly as I know, but even my driving school lector advised me to do one of such exercises. It just feels a bit dumb when doing something seemingly senseless, but so it is to run in a circles for a purpose of sport.
No matter how it looks like, it employs some parts of the brain at the same time and the purpose is to train them to work together. Brain is an easily programmable thing, and also can be trained as a "muscle".
Just try to draw numbers of 6 and 8 by your both hands at the same time, it isn't easy, is it?
Anyway, I'd like to have a good laugh too, can you perhaps tell me more about that Skeptics Guide podcast? 

What the fuck? It took several PhD's to come up with advice like "drink water"? I won't say that these techniques absolutely don't work, because drinking water, stretching, and deep breathing tend to have a meditative effect and are somewhat beneficial to concentration. But how can you patent such advice as if it's rocket science?

I don't see how this is particularly irrational.  I mean, at worst it reads like someone giving off-hand advice on how to do better in the classroom.