you mean for teams? option skate generally means that the players still have to be there but skating is optional. practices generally are not option i have heard people say certain players like ovechkin don’t have to show up but i don’t know how true that is. but basically, players always have to show up for practices regardless of what thye’re going to do there. it’s about going to work at that point not necessarily playing hockey. and even injured players will go, just depends on the injry because obviously if a player shouldn’t be leaving bed or being around others they shouldn’t be showing up to practice.