just a little off topic here, but 400stud, if you look at foot position during the suport phase, the heel does (barely) touch the ground. in my opinion, it should. if you stay on your toes an entire race, i think you would end up running slower than you could. when the foot contacts the ground, the ball should hit first, immediately followed by the midfoot/heel, and then should roll back up to the ball/toe. if you stayed on your toes the entire race, the force produced by the leg extension would ultimately be soaked up by your calf, because as leg extension occurs, the force produced by this action will be transfered to the foot/heel. the heel would dip to the ground, absorbing the energy produced by leg extension and therefore, less force would be transfered to the ground, thereby slowing the athlete. correct me if i am wrong, but check out an earlier post you made abuot sprint technique. you used matt bruno as an example of good sprint technique. in the photos (#9-13), you can see his heel is down. check out marion jones and alyson felix too. more of the same.
anyway, i have last year's celar's. they are a very good spike, my personal favorite. if nike builds upon this spike, i can imagine the performance of this 2nd generation will be quite remarkable. too bad the shop i got the maxcats at didn't have the celars. they had the zoom milers though, and some kennedy flats in some really nice colors. i like to train in xc flats, because they have the feeling of spikes, but with a little more cushioning. guess i'll have to wait on those, like the celar's:tumble: