While "blithely" (as in "happy, joyous") may generally describe what going through a workout is to a fit person, it is a state of mind and not an event "pump" that keeps fit people in the game. There are plenty of moments, hours, days, weeks even, where workouts are that and ONLY that: "work". Not fun work either. Hard work. My mindset is positive about exercise in general (ie: I don't hate or dread moving my body), but it is not all happiness and "blithe".
If you consider the more current and forefront definition of blithe or blithely -- "casually cheerful, almost neglectful of due concern" -- the contrast between this perspective and reality is even greater. Most certainly my workouts are planned, carefully thought out, purposeful. I can enjoy movement for movement's sake, but I am not "blithe" about my workouts. And I'm willing to bet that most fit people would say the same.
I just don't want people to look at me and say, "Oh, but you've ALWAYS been athletic and fit ... no wonder exercise is no big deal to you." I want them to, instead, understand that a lot of hard work and determination goes into being fit. I want them to know that I haven't always been lean and fit. I want them to know that, as a teen, when I would run, my thighs would chaffe (so I know *that* kind of pain as well ... physical AND emotional, since my thighs were large enough to chaffe!). I want them to know that I still fight battles with myself over simply getting my butt to the gym. And, finally, I want them to know that it gets better. It's still work (that's why it's called a workout, right?), but the gain begins to overshadow the pain.
Here's to proper perspective. It can make all the difference in attitude and action.