One of my old colleagues invited me to participate in volleyball in the local club. It's just mix-volleyball (both genders) and it is usually both fun and exercising (I used to play some years ago).
It was really good, I remembered how to move and how to hit the ball, but my speed and accuracy was of course not exactly like the last period I played - I hope it will come back with the practice.
I buildt up quite a sweat, so the next time I will have to bring more than one t-shirt. Lucky for me, us computer people always have plenty of t-shirts.