Moon Girl and Devil Dinosaur - Season 1, Episode 5: Hair Today, Gone Tomorrow

 

Moon Girl fights her hair-clone Mane in an even match. She usually subdues her villains by launching her boxing gloves at them.

Gun Honey: Blood for Blood #3

A panel of Filippa Sterling training. The rest of the page is NSFW.

Daredevil #52 (2003)

 

A page of Echo training.

Stanley Animations - My Teacher LEAKED Her "LOVE LIFE"

https://www.youtube.com/watch?v=q_I6CTBSJdI

Quick still involving a female boxing match.

Reanimator #2 (2015)

 

Female lead Susan Greene hits the heavy bag kickboxing. 

WORLD OF BETTY & VERONICA DIGEST #25

Penny Parker has a quick sparring session with a male opponent.

Eight Limbs (2023)

"Joanna, a retired Muay Thai champion, takes in a troubled foster teen and decides to train her, until the teen finds herself entangled with a dangerous group of criminals running underground fights and Joanna must return to the ring to save her... and keep their new family together. 

 After the devastating loss of her Muay Thai championship title, Joanna decided to walk away from competition, start a family, and open her own gym. But her quiet life gets disrupted when an old friend asks her to temporarily foster a troubled teen. Just as Joanna believes she is starting to break through Mari's walls, a misunderstanding drives Mari to run away and join an underground fighting ring. Joanna vows to do anything to get Mari back, even if that means stepping back into the ring..."