Kaarlo Koivunen Trains Endurance and stamina by just basically skating or running or anything really fast so he starts to breath a lot so that makes him train endurance and stamina also to help that he tries to make sure everytime he can he doesn't rest for a long time making sure hes always out of breath to get that extra stamina and endurance this is only for those elites who think breathing is necesarry its not you can just stop breathing and be fine like if your saying Umm acctualy no you cant then your WRONG have you ever tried not breathing? (for legal reasons this is a joke do not acctualy try it it will hurt you) with this training now kaarlo koivunen can play the entire game at a time but he is genereous so he only plays one third of it so others get ice time