Exercise is not supposed to be fun. If it is, then you should suspect that something is wrong.
When I was a young man in my 30s, I was jogging 20 miles a week and ran a couple marathons (26.2 miles). I enjoyed it and didn’t do much else for exercise or overall fitness. I thought I was in pretty good shape. You can get away with that when you’re 35, but not when you’re 50. At 57 now, I can’t think of any single recreational activity that can help me maintain the overall strength, functionality, and injury resistance I want and need as I age.
I’ve come to view exercise as a chore, like flossing/brushing teeth, changing the oil in my car, and sleeping when I’d rather not. I’ve got my current exercise chore whittled down to an hour three times a week. OK, sometimes just twice a week.
Skyler Tanner takes a thoughtful and in-depth look at the exercise versus recreation dichotomy at his blog. If you have comments, more people will see them at his site than here.