They might be fighting for their future sustainable health as some issues probably already manifested themselves and reduced their quality of life. Such a training after a lifetime of not caring is no fun...
I'm 44. Oddly enough, it was only after the spectre of long-term health issues raised its head that I was able to let go of some of the stress and just enjoy exercising for what it is, even beyond the health benefits. I'm almost (almost) thankful, in a way.
