Well, just to make you feel better, I'll admit we've been driving to the gym too.
:-o
I always use the equipment I don't have at home, and usually take a group class as well (I can't motivate myself to do high intensity aerobics for more than a couple minutes otherwise)
I was working out with my free weights at home, but my SO found she couldn't get in a good workout with all the distractions available at home, and we were able to get a joint membership for $60 a month (no contract).
I bike there sometimes, but she won't because she says the hill (its a big hill) hurts her knee. So, if shes driving anyway, I may as well go with her.