Season 4 - Episode 171

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Location: Gwangyang, South Jeolla For Sleeping Indoors or Outdoors, the members participate in Physical: BACK, where they try various tests to see who the weakest is. They must gain 100 points first through various physical activities to be able to sleep indoors. For the morning mission, they must run a marathon and complete seven missions prepared in the course. The winner gets a complete meal of freshwater clams, Gwangyang's specialty.