Nike Free TR Connect Premium Women's Training Shoe - $170 I bought these to teach Insanity and BODYCOMBAT. They are replacing Nike Free Bionic which I returned because they hurt my feet so badly after the 10 minute Insanity warm-up that it hurt to stand, let alone workout! I did my own gym workout tonight in these. They are super light flexible. I hardly noticed them on my feet. They are the most expensive Nike offers, but well worth it!!