I've been fighting with wrist/back/neck pain for a while now. I always attributed it to working on a laptop on my train commute (1 hour each way) to work. I just watched that video and tried it out at the office, it feels MUCH more comfortable. Thanks for sharing! Hopefully it helps.
I'm glad I could help. I've felt so helpless with back pain in the past that I love to share this book with anyone who's had similar problems. It's hard to imagine that the problem is so trivial, for which we seek really expensive solutions through herman millers & the likes.
Similarly there are methods for standing, lying etc.