Written Option 1:

Honestly, I have no clue how after years worth of seasons, nobody has gotten injured. It seems too suspicious... there can be only be one way. And that's robots. Think about it, how else can we have animals playing hockey at a high level other than that? I'm all for Air Bud, but it seems improbable. As for if the robots broke? That's what line changes are for. I don't believe stamina exists, it's just a scam to allow the robots to get repaired in game to go back out and play more. There is one human element about this though, the Goalies. The goalies just have godlike durability and are allowed to play in this high paced league with literal metal against them. It also explains how some of them improve, as they just adjust to the programming of the robots over time, instead of actually becoming better. (Or maybe this is all a conspiracy theory)