weight loss now, exercise later

My husband is an exercise fanatic. He gets up early every morning and hits the gym. He is so good about it and I have seen the results, he's really looking good. He tells me I would feel better if I could put exercise into my day. I have a 5 month old and a 2 year old, so I am pretty active. I gained 25 pounds with my last pregnancy and have lost 27 pounds. I am on the best weight loss plan there is, it's called nursing. When I nurse a kid I drop 8 pounds below my normal weight! It's total genetics, but I'll take it, since it won't last long! After I stop nursing I'll be hitting the tredmill!