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The Crucible features 29 problem-solving exercises and 36 checkpoints. Recruits help each other scale walls and climb across moving parallel bars while hauling their equipment. Food and sleep deprivation are intentional, and not all events are successfully completed, Marines said.

Wow, these guys have my respect and sympathy. I workout every day for 20 minutes and I love to play sports every time I have a chance, but I couldn't possibly imagine doing something like that. I'd probably drop dead on the first attempt, LOL!