I can easily understand why people hate the gym. I hate every form of organized exercise (with the exception of horseback riding, which I haven’t done in years but loved when I did, whether or not it was in an organized form.)
And I can understand why people who hurt whenever they move, and/or can’t breathe right if they move, don’t like moving.
And everybody isn’t me. So maybe there’s some reasonably healthy people who don’t like doing anything but sitting and/or lying down.
But I think for most healthy people, and many not very healthy people, there’s some form of movement that does actively feel good – the stretch and pull of the muscles, the deeper breathing. Our bodies have evolved to do this, after all, just as we’ve evolved to eat – why wouldn’t it feel good? Of course overexertion doesn’t feel good – that’s telling you that you need to rest. And for people not in the habit of moving much, it may not take much to hit that point; but going slightly past that point each time will move it further out, if it’s habit that’s the issue.
What feels good to a particular person isn’t necessarily calesthenics, of course; though those feel good to some people – didn’t you ever see a little kid doing jumping jacks for fun? We get told to sit down and be quiet so much, I think a lot of us lose that. But jumping around for the fun of it can feel good to adults, too – if we get out of our heads that it’s childish, and also get out of our heads that it’s something we Ought to Do, which gets in the way. Hard to enjoy something you’ve been taught is a chore. And if that’s not fun, there’s swimming, walking, dancing, bicycle riding, horseback riding, gardening, skateboarding, ball games, non-ball games, playing with a dog or cat or child, playing on the swings – I’m certainly leaving things out. Don’t think of it as exercise, think of it as playing.
Most people don’t all that much enjoy house cleaning or carrying the shopping around or washing the car or mowing the lawn or painting the house or whatever, but some do. And all of those things, and many more, involve moving around.