My girlfriend and I have decided to go swimming once a week, where we try and swim as much as we can in 30 mins. I usually do about 750m, but sometimes i manage 1km.
Then i play football for two hours on a friday. Theres no training or anything, it's just for fun, but i feel there's enough exercise there to keep my body from giving up.
Otherwise i do an awful lot of walking. Where i live is a really good place for walks, as the whole town is within walking distance, and our best friends live about a mile away. Since we visit three or four times a week, thats about 8 miles walked per week.
Still, i could probably stand to lose some weight.....i tried doing that 100 push ups once, and did quite well, i was doing 100 every time, albeit with some breaks in between, but now i just don't have the time (or the space) to do it...