Danberu nan kiro moteru? Coming Soon
https://www.youtube.com/watch?v=2YPtn01c66M An anime about a girl who joins a gym to get fit. The manga features boxing workouts. If the anime will feature anything new is not yet known.
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OK K.O.! Let's Be Heroes - Season 2, Episode 32: Gar Trains Punching Judy
Punching Judy seeks K.O. and Mr. Gar's guidance to help her defeat her sister, Punching Trudy. Lots of training montages and two fights. Both ending in one punch each.
Zoku Owarimonogatari - Episode 05: Koyomi Reverse, Part 5
Yotsugi Ononoki appears as boxer in one scene.