As you can see that the main genre of this anime is SPORT, so technically it's a Sport Anime, and from that point of view I can say that this is one of the best sport anime. But it's not really a "sport" anime and I'm going to tell you why.
Well, I looked up the reviews on this anime before writing my own and I found an interesting one, to clarify I really love this anime but there are some cons in it. As I said before, I found an interesting review where was said that this anime is not realistic in terms of sport. For example, there was one character who was the weakest in the team and he was running 5km in 35+ minutes, but only in about half and a year or a year he was able to run a 5km track in 16 minutes which is not possible in real life. An amateur can achieve a 5km in 20-25 in a year or more and it is already very difficult. So sport's stats are not the strongest part of this show.
But that's not why I love this anime, this anime is about passion, drama, hard work and power of the friendship, there are so many things that made me cry while I was watching it that I couldn't even count. I cannot tell you why this anime made me feel this way otherwise it would be a spoiler, but if you want to watch some slice-of-life drama that is happening on the running track, this anime is definitely for you.
Btw I rewatch this anime every year and it's motivated me to start running
