Okay, but how much you find it addictive, and how much you feel you need to concentrate doesn't mean it'll improve brain plasticity in elderly people. In this study, they did a form of strength training and it didn't improve brain plasticity nearly as dance.

So I mean, it's hard to have someone just come in and say: "nope the data is wrong my opinion of this activity I am biased towards as I practice it myself is right", and not be somewhat skeptical. Yes, this is a small preliminary study, maybe the type of strength training was responsible for the failings, etc. But it's still much more substantial then someone's opinion.