I run every other day, about 3 miles and I don't really intend on doing much more than that. I run on sidewalks outside, mostly. I have a bad knee from years of dislocating and a bad ankle from various injuries when I was younger. I used to use the older bulkier shoe for running until I got these as a gift. I have been using them for about 2 months now (only for running) and I really love them. They are light, so I find myself running faster, and I was surprised that my knee and ankle felt pretty good after running. I have to say that I would recommend these shoes to someone that has similar needs to mine as a runner. One of the major downsides is that rocks and whatnot get stuck i the bottom of the shoes. I usually get at least one pebble stuck in there every time I run, but it may just be where I run.