Sprinting seems like a worthwhile ~weekly activity

iirc someone said something about most ppl over N age never sprint again in their life

ideally one tries to delay N as long as possible

yeah, and i believe your fast twitch muscles are use it or lose it in a way slow twitch arent (hence why you see so many older marathoners but not really 5k and under)

yeah unless you’re running after a missed bus 😰 then it’s a weekly occurrence

I try to sprint everyday for no reason. 
you see that light? let's sprint to it.
that sign post? if you don't sprint you're g--
this person is jogging beside you.. hmm let's do a quick sprint they want  to race.