The loser walks or jogs marathon-scale mileage in continuous laps inside a single big-box store or around a mall, tracked by a fitness app and a supervising leaguemate. Staff suspicion grows with every lap. Twenty-six miles of retail carpet is a special kind of purgatory.
Heavy sentence
Severity 4 punishments are the ones people talk about for years, which is exactly why they need full league buy-in before week one. Put it in the constitution, set the deadline, and agree on proof requirements up front.
Budget note: this one costs nothing but dignity, which makes it a strong pick for leagues that would rather spend the pot on the champion than on the loser's downfall.