no-one suggest sex, I am saying this now so no-one can feel smug for saying it later.
Whereabouts do you live? Near where I live is Cannock Chase where there are loads of bike trails which are lots of fun, and you can hire a bike there too. Other things:
fly a kite, if it's windy.
go for a trip to a different city on the train and explore.
set yourself challenges, like taking ten photos to do with something. I'm not feeling that inspired right now so can't think of any suggestions for subjects. It's not that physical but at least you are outside, which is always good.
if you have a few days off you could go youth-hostelling, that's really fun but maybe a bit much for what it sounds like you want to do. But maybe you could grab some friends and work up to it; trying to persuade my friends to come out with me to the Peak District sometime.
maybe you could do some kind of voluntary work outdoors? That would get you out and would be rewarding. You don't have to spend very much time doing it. My brother works at the Blue Cross centre in my village looking after horses for D of E.
block
KR from your computer
(I need to do this)