I work up a sweat on the treadmill. For the sake of reserving my shoes for as long as possible, I only stayed on for twenty minutes. On the good note, I didn't take any breaks what so ever during the entire twenty minutes that I worked out on the treadmill so that's a good thing. Before that I had worked out with my weights, and afterwards I did some non weight lifting worklifting, and then I'm going to do standing workouts----off the treadmill of course. At first I was going to wait to get new shoes before I went back on the treadmill, but then I decided that I would go on the treadmill for twenty minutes so that I can warn them out and then I'll have no choice but to go and buy those shoes from City Max, and I won't be thinking, "Well I could have waited," That's what I'm thinking now. I can wait a while. At least till these shoes are no longer wearable.