The playground isn’t just for kids running amok anymore! Parks and rec departments across the country are investing in adult playground fitness equipment, many of which rival some gym offerings. With gear popping up in green spaces from San Antonio to New York City, chances are you have access to some of these outdoor exercise machines.

Although some are odd looking, don't laugh them all off—you really can strengthen and define muscles with select equipment, but others could leave you sidelined all summer from injury. Here are the five most effective and five least effective devices.

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