For over a year now I have been taking a Body Pump class at a nearby gymnastic/exercise studio. A friend (who no longer does BP) asked me to join her and I did and I loved it! I started out going 2 days a week, then 3, and now I can only handle once a week. I even talked my 3 daughters into joining me for some classes. The instructor is a friend of mine and is also a certified Piloxing instructor which she teaches right before the Body Pump class. She is incredibly fit (tiny but mighty). Not only does she teach, she runs insanely fast, fast enough to qualify for a spot on the coveted NUUN Hood to Coast Relay Team!
Originally I used the twice a week BP class as my cross-training days when I was training for my half-marathon PR (which I achieved in September of 2011). But now, I go to keep my muscles strong so I can just continue running.