Suppose you want your increasingly sedentary 3-year-old, who happily still craves your attention, to get some exercise outside and play on the swings in the backyard more often. Problem is, he rarely even goes outside. What are you going to do? Instead of waiting for your 3-year-old to get on the swings, you can reinforce his behavior every time he gets near the door. After a while, he will spend more time at the door. Then you reinforce his behavior only when he opens the door.
