My day this afternoon was similar. I spent the morning running eight miles (which is far from my farthest, but the longest run I've done since November) and cleaning the entire house for my wife's jewelry party. While I'd be lying if I said either was "fun", I felt great about both of them afterwards. It was work which needed done, and the best way was to tackle them head-on.
When you think about it, there's something about a small, manageable amount of discomfort that's challenging and fun. Eating really hot wings, watching scary movies, and eating sour apple candy are all excellent examples. Sure, there are more mild wings and funnier movies, and sweeter candy, but there's something about the pain, tedium, discomfort, and challenge that makes the object all the more enjoyable in the end. Of course, that's what any type of learning is; it's getting through a small amount of discomfort to get better. Anything less, and you stay in the same place forever.