One of my pet peeves is calling a game whose players don't actively employ defense a sport. I love running, weight training, biking, and (if I knew how to do it right) skiing as much as some sports, but sports they ain't. Anyways, I'm a rugger, too, and I'll actively suggest it. Most men's sides don't take up too much time (some practice just twice a week, with only once being mandatory for playing time), they love taking on newbies to the sport, and, well, rugby is the most fun I've had on an organized playing field (after doing nearly every physical activity out there). I think the intensity and physical demand of it is closest to hockey, if you need something to compare it to.