Actually in this show I think it is pretty straight up. They don't get kicked off the show, but rather they each have a SPOT beacon and can signal for rescue anytime they feel they can't go on, or whatever their reason to check out is. Interestingly (to me) the most experienced hiker (quit in the last show) said that he came to push himself to his limits. He was frustrated at having to wait on the slower hikers. I guess he found out what his limits were and that interacting with others was not included.
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