This actually looks pretty cool and could really help a lot of people. I've been running a few years now, and a couple of years ago I started to get serious knee pains. A physio basically explained to me that my legs move in totally the wrong way, and I had no way of knowing this until he showed me what was going on, gave me some advice and helped me fix these bad habits. It really, really helped - for that kind of advice to be given in real-time during a run would be absolutely fantastic. Running isn't just about distance or speed!