Why can't we jump off this cliff backwards?

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This is one of the dumbest questions you can imagine, but it's something I get asked quite a lot. Always in a different way, but basically it's the same question each time. This is mainly something I experience with boys. Their level of risk taking behaviour far outweighs girls on outdoor activities. No matter what the activity, someone in the group wants to push the boundaries so far that it risks stepping right outside the safe parameters of the activity.