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Don't underestimate the power of peer pressure when it comes to physical activities. It's one of the main draws of Crossfit, and probably the strongest force for these people when they push themselves too far.

When you're working out with someone who you barely know, or may have just met, who doesn't know what to expect and doesn't know their own limits, and is trying to keep up with everyone around them, you have a recipe for someone pushing themselves too far to a dangerous extent, whether the outcome is rhabdo, a tear, or some other injury. Most desk jockies (myself included sometimes) don't take the proper care that you need when you try and start moving a body that sits idle for 8-10 hours a day.

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