Ah .. that kind of makes more sense.

Language barriers and all that.
I would say that Addie has pretty much nailed it for me.
I will also say that as someone who was very overweight, exercise of any kind was NOT fun. It wasn't even something I thought of as "bearable". When you're that overweight, it's very very difficult to get moving. You get out of breath easily and quickly, you get hot easily, you sweat unpleasantly, fat jiggles and bounces in a way that's uncomfortable at best and painful at worst. You can't touch your toes, not because you're not limber, but because your gut gets inthe way. Or your boobs. Or both.

You can't lower yourself to the floor w/out major contortions and grunting and effort - and don't even think about getting up off the floor, much less doing it gracefully.
And then you add in the visions you get of fit and healthy trainers working out, exercise videos of people doing things that you can't do ... it's all just overwhelming.
It's very hard to visualize how you'll get from HERE (being fat and out of shape) to THERE (being slim and fit) w/out thinking it's going to be painful and embarrassing and ultimately unsuccessful.