I started out on the treadmill and did some weights and ended up doing a 1/2 hour of zumba. I don't ache. I had on different sneakers, maybe that helped. The official zumba sneakers don't have much support, so I will try my old ones for a couple of weeks to see if that helps any. I weighed myself. On my scale at home, it appears I lost 1 lb. I really thought I might lose more. Maybe next week. The number on the scale really bothers me. I can't believe how much I weigh.