This is why I built a walking desk. And funny thing is that, I have tested this that my dual n-back scores are marginally better when I do them while walking at the speeds of 1-1.5 km/h.
I built one, too. The only problem is it never remains where I left it. One time the police brought it back, as it had wandered into somebody else's home. Another time, I found it lying in an alley in a pool of machine oil and stinking of WD-40. I'm going to have to stick one of those Apple tracker thingies on it.
