8. The Gliding Ring
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Sasuke is a Japanese obstacle course show that inspired American Ninja Warrior, among 27 other incarnations.
Famously tough, the Gliding Ring requires contestant to grasp two rings that are hung on parallel bars with notches. As the rings get stuck in the different notches, the contestant must use his body strength to bring them back out and continue surging forward. All while suspended above the ground, of course.