Homer purchases a discount dumbbell and Marge purchases a bicycle built for two at the grand closing of Paradise Pier. While Homer focuses on toning one arm, Marge becomes upset she can't convince a family member to ride with her. After seeing the bike in the Goodwill pile, Bart's conscience gets the best of him and he offers to take a journey with his mother. The duo bond on the trip and Bart soon ditches his friends to spend time with Marge. Homer is concerned with Bart taking up more of Marge's time; but rather than address the situation, Homer and Moe enter Homer's now massive bicep in an out-of-town arm wrestling competition. When his friends accuse him of being a mamma's boy, Bart publicly denounces his relationship in front of his mother. Bart's conscience catches up with him again and he returns to Marge; however, Marge is happy enough knowing their time was genuine and she encourages Bart to return to his friends. After winning the tournament, Homer realizes he has been neglecting Marge and returns home.