Creative prompt

It really depends on what the aliens look like. If we are to assume they are humanoid and have similar anatomy to us, we can teach them the way we play it. It might be difficult due to a language barrier, unless they are super advanced and have universal translators or something. We would have to teach them through action. If they take a non-humanoid form, it is very difficult to teach them hockey. We have to engineer new equipment for them, and for that we need a larger understanding of their anatomy and what areas need most protection. We need to determine where to put the skates, and how they can hold a stick. Then, after figuring all of that out, we have to find out how to most efficiently play hockey for them, and teach it. Which is especially difficult because we do not have the same bodies as them, so we can't exactly use our bodies to show them how to play.  In summary, it would be extremely hard to teach aliens hockey