As we're off into fitness (and it's raining too much for me to be working) let me tell you my story - (pull up a sleeping bag).
I'm nearly 46, weigh 12st 13lbs and am 6'0" tall. (I want to be 12st 7lbs by my 46th birthday at the end of May.)
Between ages 24 and 37 with up and down fluctuations and failed diets and "stuff it" attitudes I crept up from 12st 6lb to 16st (up 50lb!) - my jobs were always sales/office and I spent my time sitting behind a desk or a wheel. In 1996/7 I went self-employed, did a bit of selling and bought £200 worth of window cleaning "to help me get fit" and get some extra money.
I read articles about diabetes and heart disease (as these are in my family) and decided I wanted to prevent them as best I could and be around for my growing family as a healthy Dad as long as possible.
The weight gradually came off and I dropped to 15 st by 2001.
Then I got serious about it and started eating more sensibly, reducing stress and cycling for an hour twice a week (more in the summer, less in the winter) - and my w/c round has steadily increased so that it has been my full-time occupation since 2001.
In 2003 I started hill-walking and go about three or four times a year on full days or weekends in the Brecons or Snowdonia. And do shorter walks most months too. I feel fitter now than at any time in my life - including my late teens/early twenties.
But the real key for me (maybe you too) is I know that when I get stressed I want to eat (some folk stop eating when they're stressed, others - it makes no difference) and window cleaning is the least stressful occupation I have ever had.
At rare times I hate it - but I never dread it! Mostly I love and enjoy it! And now I've gone pole-crazy for most of my work I love it even more - and earn more as a consequence.
MalcG of the "happy but not complacent" class.