Jerry Miszewski of Davis balances on a slackline strung between trees in Community Park in February 2013. By local ordinance, slacklining is permitted only in Oak Grove Park, Covell Park and on the Covell Greenbelt. Fred Gladdis/Enterprise file photo

Slackliners walk on nylon webbing anchored at two fixed points (usually trees). Fred Gladdis/Enterprise file photo