"Point being, the life of a professional athlete in the making is (mostly) not glamorous or exciting, but rather a very narrow existence comprised of pure persistence and dedication to a small set of very specific movements and activities, repeated over and over."

Same as most professionals. But more reward. More risk. More need for innate qualities.

"...like to watch, even though we have no inclination to walk that road ourselves. In other words, they do it for us, sacrifice themselves for our redemption."

They "sacrifice" for fame and a comfortable lifestyle, just like everyone else.