Hey all. Just wanted to chime in and emphasize the run/walk thing. I just started running a couple months ago. I always hated running. I used to swim a lot and bike but running hurt my knees. So lately, I've been really crunched for time with work, school, business travel that I needed something that would be a hard workout in a short amount of time. My roommate runs so I decided to really give it a try. I started out slow, 1 min jog, 1 min walk. I found a plan online called couch to 5K. It's been great! I definitely recommend it.
http://www.coolrunning.com/engine/2/2_3/181.shtml
I'm still slow and working on adding the miles but I'm actually starting to like it. I've always rushed into doing too much too quickly which made me hate it. Hope that helps! Good luck!