"People conceptualize conditioning in different ways," he said. "Some think it's a ladder straight up. Others see plateaus, blockages, ceilings. I see it as a geometric spiraling upward, with each spin of the cycle taking you a different distance upward. Some spins may even take you downward, just gathering momentum for the next upswing. Sometimes you will work your fanny off and see very little gain; other times you will amaze yourself and not really know why. Training is training, it all seems to blend together after a while. What is going on inside is just a big puzzle. But my little spiral theory kind of gives it a perspective don't you think?"
"Yes, but I don't see --"
"You've been in that momentum-gathering phase, Cass, is what I'm telling you. You've been in it for quite a while now and I think that - physically again - you're due."
- Once a Runner, pp. 166-167