Jon has brought in a scale, and Garfield decides to tamper with it so he can trick Jon into thinking he is overweight.
Jon comes home and Garfield thinks his arrival will be on the news that night. He announces what he has bought; a new scale, which also tells fortunes. Garfield tests it, with the scale misunderstanding what he was trying to do. Garfield then decides to tamper with the scale to trick Jon. Jon then tries out the scale, which tells him that he is 50 pounds overweight. He decides to go on a strict diet.
After Jon eats lunch, he decides to workout, getting a reluctant Garfield to join him. While Jon and Garfield workout, they jog through the driveway, with Garfield quickly becoming tired. Jon suggests they go west, while Garfield suggests they go east. Jon thinks he just wants to take the shorter route; as he runs forward, he falls into an open manhole.
Later, Jon and Garfield try out some weights. Jon tries it alone, only to find it especially difficult. Garfield and Jon each pull one of the weights. After spotting an apple on the ground, Garfield gives his weight to Jon, who gets flung into the house.
Jon and Garfield then play an aerobics workout record. Garfield, who soon becomes exhausted, speeds up the music to finish the workout sooner, causing Jon to move fast enough to fly. When Garfield stops the music, Jon falls down to the ground, with Garfield quipping, "You know, you should stop trying to improve your health before you remove your health."
Garfield comes back inside the house and tests the scale before putting it back to accurate weight. Jon returns to weigh himself again and, soon after the scale tells him the truth whilst telling him his fortune, discovers that he has been had. In a rage, he chases Garfield out of the house and down the street.
- The Scale