I had 2 level spinal fusion three weeks ago. I am walking 1/2 mile around my neighborhood. I would like to walk on a treadmill without incline. Does anyone think it is too soon? The doctor told me to wait until after my physical therapy starts next week before I go to the gym and use elliptical or stationary bike. I never actually asked him about a treadmill. He is on vacation. I have a treadmill and would really like to start using it. Any thoughts on this?