One of the most fun active sports that I have played in a long time is racquetball. Very physical and very fun. Get a standing game going every week with some f

One of the most fun active sports that I have played in a long time is racquetball. Very physical and very fun. Get a standing game going every week with some friends and you will notice your cardio benefits quickly. I also have a blast doing it because there is so much action going on that you don't have any time to think about breaking the build or anything else really. I will also second the rock climbing gym as a fun exercise too. While it is physically demanding it takes longer to get physically drained so that could be a consideration. (3 hours vs. 1 - 1.5 hours for racquetball).