I only wear them to work, where I have a sedentary desk job, and have never used them to exercise. Shes keeping it. If you are considering this shoe I suggest you look for photos elsewhere to get a good image. Great bikes I weigh 230 and it carries me just fine not so fine up hills but I get up them lol I mean I only paid 246 per bike and I got two the wife and I are going to take these on some bike/running trails around the park and downtown its going to be great also on Reddit I saw few people even upgraded the battery of their Jetson/dyu bike with a 10w battery that is is the same size as the current one for the price I love this thing We received them as I ordered them for my daughter because she can only wear sandals with back straps to school. Lots of support I was a little worried when I saw instructions were only in Chinese, but there were drawings along with the text that told me what I needed to know. While the company states up to 30 hours with the case, I only seemed to get 2 1/2 extra charges from the case. Now I dont have to feel gross about lego germs! It holds it very tightly but is very easy to put in and take out.