OK K.O.! Let's Be Heroes - Season 1, Episode 22: Plaza Prom

A quick glimpse of Judy's blog.

OK K.O.! Let's Be Heroes - Season 1, Episode 21: You Have to Care

Elodie visits Lakewood Plaza to connect with the little people.

NEW GAME!! - Episode 6: Wow... It's So Amazing..

http://www.crunchyroll.com/new-game/episode-6-wow-its-so-amazing-742161

Hajime does some boxing for motion capture for a video game character.

Gintama - Season 1, Episode 106: Love Is Often Played Out In Sudden Death

http://www.crunchyroll.com/gintama/episode-106-love-is-often-played-out-in-sudden-death-510274

Otae comes to a soccer match thinking it's muay thai.

Gintama - Season 1, Episode 27: Some Things Can’t Be Cut with a Sword

http://www.crunchyroll.com/gintama/episode-27-some-things-cant-be-cut-with-a-sword-510090

Pop star Otsuu has a short stint as a fighter. Quick scene.

Senki Zesshou Symphogear - Season 1, Episode 5: From the Bottom of a Dark Abyss

Hibiki does some boxing training.

OK K.O.! Let's Be Heroes - Season 1, Episode 11: You Get Me

An appearance by Punching Judy and Carol on the bag.

Cannonball Fist

http://cannonballfist.com/?page_id=171

"Cannonball Fist is a comic about Clara “Cannonball” Jayne, a young boxer who comes to Southpaw City seeking to become the world’s greatest fighter. She fights monsters and it’s a good time."

Hasn't been updated since 2015.

Doug - Season 4, Episode 7b: Doug Clobbers Patti

Doug accidentally knocks out Patti in a fantasy sequence.