I love step class, too. I've discovered I'm a social exerciser. I do much better when I have a class to go to. I do workout at home by myself, but I am much more motivated when working out with others.
I took a spinning class last week after doing step. Yikes! Now that was tough!
less stuff, more time
(48, married; DH 52. I am fully retired as of 2015 (well ok, I still work part-time but only because I love the job and have complete freedom to call off if I want to travel with hubby for work), DH will fully retire 2018 when he turns 55 to access 401K penalty-free)