Just that feeling of having burnt yourself out, as you swing yourself into momentum and keep going, faster and faster as you quicken your pace to no limit. You are unlimited, 'infinite', do everything they said you'll never be able to do.

Every morning in Africa, a gazelle wakes up.
It knows it must outrun the fastest lion or it will be killed.
Every morning in Africa, a lion wakes up.
It knows that it must run faster than the slowest gazelle, or it will starve.
It doesn't matter whether you're a lion or a gazelle
when the sun comes up you'd better be running.

People may not have high expectations of me, let alone any, but it's enough that I have high expectations for myself. I don't like what I'm letting myself turn into...