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Limitless With Chris Hemsworth proves he's more than just Thor: In this fascinating National Geographic documentary, the Hollywood A-lister spends a year testing his physical limits to discover the extent of the human body's capabilities and try to stall the aging process. Over six episodes, Hemsworth puts himself through a battery of tests developed by experts meant to do everything from building up his immune system to improving his memory. Hemsworth fasts for four days before going hunting for food, swims 800 feet across a nearly frozen Arctic fjord, and climbs a dangling rope 100 feet above a canyon. The docuseries illustrates how even the strongest and fittest people can reach their physical and mental breaking points. The episodes are available to stream on Disney+ (watch trailer, runtime 2:20.)

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