The harder routes you climb, the more interesting the climbing gets and the more crazy moves you are forced to figure out.
I shriek when I am climbing at my absolute limit, but never shriek in the warm-up or when trying the moves. No matter how terrible it might sound, it helps me.
What really motivates me to climb harder and harder is not necessarily that I want to push my limits or show who's best, but climbing harder and harder routes makes it more fun.
For the Olympics, I'm mostly training in the gym, so I'm running laps on the standard speed wall.
I thought I knew how to jug, but when you only jug 30 meters to the top of a sport climb, you don't need good technique. But jugging 400 meters, that's a big deal.
I didn't want to hike to the top of El Capitan and rappel down the route, and start fixing lines. For me it was really important to try to climb it from the ground up at first.