Athletic people tend to say that, but I really doubt it's true for everyone. I have never enjoyed sport - being out of shape it sucked more, but while maintaining a sensible training regime I really dislike it as well. For me it's about as enjoyable as doing housework. I do that too, but not for fun.

The only thing that has helped me is to accept that evolution is a bitch and biology is unfair; I will probably never enjoy working out, but I can do it anyway and find a form of exercise that is kinda okay and allows me to listen to good music while I do it.

For some people, "it will be fun one day" just sets a really unrealistic expectation.

This is all true however it is also true a fitness journey never ends, as you get better you need to keep pushing yourself more to maintain the health benefits, if you're just relying on your progress to cruise you do not get the same calorie burning and other benefits after a while.