I did sports when I was young. I know how to correctly do the exercises, running routines and all that. I’m still not doing it now because all of that knowledge is worth nothing without willpower.

I had gotten to green belt in judo when I was much younger. I still retain that knowledge. It still wouldn’t stop my back from going out if I tried to throw someone now and I probably wouldn’t win in a sparring match even against a white belt unless they were a child. The point is like GI Joe: knowing is only half the battle.