Why it worked
The video cleverly connects a popular form of passive entertainment (watching a TV show) with a fitness goal (walking steps), making the idea of exercising more accessible and less daunting by framing it as a byproduct of an enjoyable activity.
Summary
A person walks on a "WalkingPad" treadmill while watching an episode of "The Mentalist" on a laptop. The video suggests that watching one episode of the show is equivalent to completing 7,000 incline steps.