Originally Posted by Little Bike
I think what happened was that when I pressed down with the amount of foot I could it wasn't engaging the big leg muscles like putting down a whole foot. Best physiological guess.
That sounds about right. It takes some time to learn the mechanics of getting your heel down while wearing anything over 2" tall, and a really good sole with a metal arch in it.
I usually don't get on the bike in anything more than 1.5", it's just annoying.