I did my half hour of treadmill last night. Didnt do much over 30mins...my knee started to hurt. If it wasnt for that, I would have walked a lot more, I had my trusty Kindle with me, and my Stargate novel was getting exciting at the point that my knee made me quit.

I really really love that Kindle. So much easier for me to walk for a half hour or more when the Kindle is distracting me from the actual walking.