Stay at home moms out there what do you do to keep active?

i quit my job when i was 5 months pregnant well now i have a 3 month old and two yr old. im gaining weight ive gained 10 lbs since she has been born i live in the country on very hilly roads so i can't exactly just take them for a walk when i want and i live 15 miles to nearest town so i can't exactly stroll to the park everyday for money reasons. I hate taking the kids outside because my two year old always runs off or when i do take her outside its hard to drag the baby everywhere. The both take there long naps of the day together usually about two hours from 1-3 in that time i usually clean the house but what do you do to stay active?