>>2791999I think Korone runs underground boxing tournaments at the bakery she works at.
Think about it her stamina in long streams, knows how Japanese mafia works, has straight up said she can beat up anyone in hololive, has googled how to torture people. She goes to the gym everyday to box while having an endless supply of protein supplements.
Combine those attributes in underground boxing where she shows no mercy to her opponent.
How else does Korone know how to tolerate pain from a broken knee while moving in around in Okayu's 3d live other than experiencing similar injuries in the past via those underground tournaments.