I always seem to be confused about some aspect of cycling. Now is no exception. I have recently moved my seat position fairly far back at the insistence of what we can call my coach. Former racer, LBS owner, etc. Sure enough, my pedaling power increased, along with speeds, and virtually no hand, arm, or shoulder issues. Feels great. Now my confusion comes from whether I am using primarily quads or glutes in this position – and more importantly – what difference does it make which I am using? Also, from this back position, should I be using heals down or toes down as I come over the top? I will sleep much better if I eliminate the current confusion.