Local slackline enthusiasts are lobbying the city of Boulder to relax its rules and allow the sport in Boulder Canyon, other open space areas and city parks.

A boom in popularity and a community of about 100 slackline "addicts" has meant more people practicing the sport -- and drawing more attention. Earlier this month, police were called about someone slacklining -- walking on a narrow, flat nylon line that's not pulled taut -- in Boulder Canyon, but the person was down by the time rangers arrived.

Larkin Carey, with the Colorado Slackline Club, said Boulder's law against attaching anything to trees in public places generally hadn't been enforced. Slacklining on open space, where it's not an "approved" use, also hadn't been an issue in the past.

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