 If you liked
Shijou Saikyou no Deshi Kenichi
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 ...then you might like
Hajime no Ippo: Rising
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Both anime are about boxing (though in Kenichi it´s martial arts in general). Both main characters are nice and naive guys who start to train with the objective of learning what is to be “strong.” Both anime have some comedy in them. Ippo and Kenichi always get to fight stronger opponents, and they have to keep training desperately so they can win. And both training regimes are very extreme.