(“Lehrer” means “teacher”)
力戦奮闘
riki.sen.fun.tou
Literally: power – battle – invigorated – fight
Alternately: Fighting as hard as you can. By extension, working as hard as you can. Strenuous effort.

I’m mostly sure you can 力戦奮闘 even without an opponent, but this is pretty cute!
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About Confanity
I love the written word more than anything else I've had the chance to work with. I'm back in the States from Japan for grad school, but still studying Japanese with the hope of becoming a translator -- or writer, or even teacher -- as long as it's something language-related.