The trailers make it look much harder than it is. There are a lot of people who sign up (and finish for that matter) who don't have any fitness and are just looking to have some fun.
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ech·o cham·ber
/ˈekō ˌCHāmbər/
noun
An environment in which a person encounters only beliefs or opinions that coincide with their own, so that their existing views are reinforced and alternative ideas are not considered.
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