Athletes in pretty much every sport historically have gotten bigger, stronger and faster over time. That’s true in bowling in the sense that what today’s top players do is more powerful and athletic — no player had a 500-plus rev rate until after Mark Roth began to change the game, with the 2-handed technique the ultimate manifestation (so far) of the trend. But I think it can be argued that perhaps the most significant advancement in bowling athletes has been mental, driven...