Mike and Lisa are outside their apartment.
Mike: Great walk! I'm so proud of us.
Lisa: Ooh, I bet I got thousands of steps on my Fitbit!
Lisa looks down to where her Fitbit should be.
Lisa: Wait a minute... Did I? Oh no. I forgot to put it on!
Mike: So? We still got the exercise!
Panel 3: Close up of Lisa's eyes.
Lisa: If a person walked, but a fitness tracker didn't track it, the person didn't walk.