Yuri on Ice. People who haven't watched it tend to only know that it's gay, which it is, but it's also just an incredible sports anime because a) it's very true to life in the way the sport and training for it works and b) the protagonist's opponents are portrayed as actual sports competitors instead of as villains - by the end, you almost don't care who wins because you want all of them to win. Also the competitions felt extremely tense and exciting to watch. Also they really crank up the animation budget for important competition scenes.

The first 3 episodes are hard to get through - way too awkward to watch - but after that it becomes an incredible show, imo.