For combat — this is what was the life motivator for Achilles.
Let us consider, Achilles had no intention of “improving“ himself, or making himself “better“.
what did Achilles desire? He just wanted Breisis, and retire back home. Yet, he still had the longing lust for battle.
In modern day times, perhaps for me at least, I have a list for the gym, the last two attempt insanely heavy weights, as a form of battle with the iron and gravity.