I joined an exercise program called Stroller Strides, and I love it. I have an 18 month old and a 3 month old, and we usually go 3 to 5 times a week. It is held outside at the dam in Valhalla MWF and in Briarcliff on TTh. The cost is very reasonable (you can pay per class, for 10 classes, or buy the monthly membership). The kids stay in the stroller while you are exercising, but you're constantly moving (and we do some singing, too!) so the kids stay amused. It's also great to get out of the house and socialize with other moms!! Both locations have playgrounds too, so afterwards you can stsy and hang out (when your baby is a little older). Every once in a while they have an expert come in after class to talk about things likeleeping, feeding, etc and have events at night oe on the weekends, some of which are just for moms. I just love it! You can check out the meetup site. It is: http://moms.meetup.com/2723/