Thanks for the replies. Since I wrote this six weeks ago, though, I've graduated from walking to doing HIIT on an elliptical and resistance training with Pilates.

Browsing through the older posts, I have found three excellent threads on walking, all started by Fern. If you're interested in walking for your workout, you should read these!

http://forum.lowcarber.org/showthre...=&threadid=6645

http://forum.lowcarber.org/showthre...&threadid=16229

http://forum.lowcarber.org/showthre...&threadid=19785

Allison