Some years when the kindergarten classes go skating, I think that one of the most important lessons that kids learn is that when you fall down, you get up and try again. With a whole class, it’s rare to see all the kids on their feet at the same time. Fairly often, there is one child in the class who spends more 
time sitting on the ice than standing on it. Some kids are discouraged after falling only 2 or 3 times; some show amazing determination as they get back up over and over again. This skill to keep trying is more than kindergarten readiness. It will get lots of practice over the years.
Watching this long Stanley Cup series, has shown the example of adults that keep trying, too. Discouragement at this level must be tremendous. Their fall-down-get-up skill gets the most practice of anybody. This is a lesson that kids learn from their own experience and from the example of those around them. While some of the things kids see when watching hockey are not at all positive examples, this one is a readiness for kindergarten and beyond. Go, Hockey, go.