Day of rest. Went to church. Came home. Ate dinner. Sat down on the couch and wondered how in the world I could run even 1 mile at 10:00 pace. If somebody erased my memory and told me I could not run a mile I would have believed him. No way I would have even bothered to set an alarm to run Monday morning without the memory and consequently knowing the potential. Thus the importance of knowing the potential.