The way that streets are laid out can have a significant impact on people's behavior and how much exercise they get, according to Charles Montgomery, author of "Happy City: Transforming Our Lives Through Urban Design." People may be discouraged from walking in areas that have a lot of cul-de-sacs, for example. "The way we organize most cities actually encourages individuals to make choices that make everyone's life harder," says Lawrence Frank, who has studied the connection between neighborhood design and health, in an excerpt from Montgomery's book.

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