Sports

Ballet and Boxing
Two young boys train at the same studio, one doing ballet and the other does boxing. They quickly bond and decide to support each others dreams.
A friends to lovers type story and there are A LOT of cute moments between them but I would consider this slow burn because both hint at their feelings but have not acted on them.

Baseball
This is the sequel to Diamond no Ace
I started reading this but dropped it after a couple dozen chapters because it didn't catch my interest. But many people enjoy this story and it is very popular so I added it on here just in case.

Figure Skating
Tsukasa, a talented figure skater but he was unable to make it in the skating world, meets Inori a young girl with a talent for skating but she has no one who believes in her. He decides that he will become her coach and make her talent grow.
I love how much he supports her as her coach. It'll be interesting to see how she competes against her rivals as she gains more skill and confidence.

Dance Sport
The MC joins his school's dance club after seeing them perform.
The MC and his partner are new to dance but they aren't amazing and don't magically become amazing. All the pairs in their club get put in the spotlight. And the author also shows pairs from other schools and how they met.
I read this in one sitting and it was pretty enjoyable

Ballet
A boy learns the female version of ballet and becomes partners with a famous male ballerina who came to their school in his study abroad.
This manga is pretty short and I wish it was longer because I enjoyed it

Ping Pong
I found this one kind of weird not going to lie. The MC wants to join the ping pong club but has a memory loss disease. So he wants to have the most fun he can with the club before he loses his memory entirely

Ballet
A boy discovers his love for ballet but after a tragic event he decides to bury his love for it and only do manly things. But years later he still loves ballet and tries to pursue it.
There is a lot of toxic masculinity that the MC has to deal with, hopefully it updates more

Ballet
This is a tragic and dramatic ballet story. The MC is basically given/has everything (talent, skill, support etc) and completely throws it away messing up her life.
This is one big downward spiral for her. Of course there are many 'good' moments for her but she is incredibly immature and selfish

Ballet
Sequel to Dance! Subaru
She has to deal with the consequences of of her past actions.
Basically, her and this blind man decide to become ballet partners performing and competing together as they have a similar vibe and bond quickly.
Note: this updates very infrequently (I'm pretty sure the story is done but no one's uploaded the remaining chapters)

Boxing
This manga has been ongoing since 1989 I believe. So, read if your dedicated and enjoy long stories I guess. I tried reading it for a dozen or so chapters and couldn't really get into it.