i'm starting to get use to the run/walk thing. i hurt myself about 3 months ago out running and finially got into town to find out what was wrong. apparently my tibia rotated out of the joint and was causing my pain. i have to tape it when i go out, but i'm now up to running for 2 mins every 4 mins. i will run agian, but i must say the walk/run i get a great workout and love it. makes me concentrate on my form.