Translation:Practice is not interesting.
As a native, I think that theoretically, it shouldn't be. "To practice is not interesting" does sound like a grammatically sound sentence. Though I guess it sounds a bit... I dunno, poetic? Like it invokes the sort of language that I'd expect of some kind of philosopher or otherwise really smart person, like in the phrase "to err is human". Which might sound like a good thing, but it's not really how ordinary people talk. Most people would just say "practicing is not interesting" or "practice is not interesting".