I've not really found a solution. I go in spurts -- a few days of walking, then slacking off and having difficulty getting pumped up again. This partly may be physiological. Since graduate school when I had to process 200-400 pages of research every night, no weekends off, I find reading very difficult. I was a great reader up to that time, couldn't stop me. Now, it's one more thing that I procrastinate about.