I read the title of the post and took it to mean what do you do to get fit for window cleaning ?
I think that if its your full time job and you have been doing it for any length of time your body is probably adjusted to its optimum physical requirements.
Does window cleaning keep you fit ?
I'd say no.
Since being self employed I have put weight on, I think I can put most of this down to the fact I drive everywhere, that includes all the things I used to do on foot like shopping and day to day stuff in town gets done whilst I am working, the amount of walking I now do has actually been reduced although I do a physical job.
I like to get out on my mountain bike and have been getting back into it this year but shorter days and weather has limited the time I get to put into it, plus the fact when I get home from work I'm knackered !
44 next month, certainly find as I get older it gets harder to find time and more effort to keep fit.
Simon