Thats funny about the shoes. There some old teva's there supposed to be spider rubber(super grippy) but there not very grippy actually there rather heavy too. I am rather incredelous how long he has run in those shoes. But its not the shoes its the traceur that matters, I have gone through 7 or 8 pairs of shoes in our year and half in training, he has used just two. Not one super grippy nice new shoe has ever given me the edge. If want to do perciscions like that forget about shoes and concentrate on the training.