Read the following scenario:

Bobby is overweight and does not engage in any regular exercise. His doctor has recommended that he increase physical activity, but he prefers video games and playing on his mobile device.
Post by Day 3:

Briefly explain how positive reinforcement could be utilized to help Bobby increase physical activity. In your post, include the following:

A proposed reinforcer
Timing of proposed reinforcer delivery
A suggestion for how to evaluate the effectiveness of the proposed reinforcer