Proper motivation needs to be in place for an individual to want to participate or succeed in an activity.
Motivation is the first thing that needs to be in place before an activity begins.
Children and adults have to want to do what is being asked of them.
Pairing is a strategy that can be used to get a specific response or reaction from someone. If someone doesn't want to go to the grocery store, try giving them the iPad or a piece of gum while they are there to hopefully create pleasant feelings about that place.
Over time you can stop using or fade the motivator little by little as your child becomes more successful.
You can help establish motivation by offering a reward to the person after they have completed the task.
A First/Then schedule is the perfect tool when doing this... "First, walk in the grocery Then, get a high 5".