I'm very disappointed! I'm so loving the walking and treadmill. But, my lower back is in so much pain I had to buy some pain patches yesterday and shoe inserts. Last night I got the Gazelle out and started using it, there's less impact on my back. I won't be doing the treadmill until Saturday or Sunday depending on how much pain I'm in. I guess I over did it last week with the walking in the snow for a hour and a half and than getting home and going on the treadmill. Hope I'm better by Monday so I can have a fresh start to the week.