Building products, writing, and painting are not mental excercises, they are physical ones.
Reading to improve is like watching someone else workout – it does almost nothing for you.
To run better, run. To paint better, paint. To write better, write. To build better, build.
I certainly agree that practice is the core of all increase in skill. However, I've found that the differentiation factor of my skills comes from being someone who reads, who looks for better ways to run. From being someone who constantly reflects on the practice that occurs. This is something that's well supported by research (the notion of deliberate practice).
Deliberate Practice: http://projects.ict.usc.edu/itw/gel/EricssonDeliberatePracti...