Spectators can always count on an eyeful of acrobatics at The Spot Bouldering Gym's competition series, but the eye-candy at this Saturday's event will include Boulder's best slackliners pulling off feats of balance high overhead.

The slackline -- a narrow, flat nylon line that competitors will walk, jump and flip upon, and probably off -- will be strung 18 feet above The Spot's springy floor.

Not that the competitors will hit the floor if they fall. They'll be tethered to the line, of course.

Brett Merlin, marketing and membership coordinator for The Spot, says the highline slacklining competition -- which falls in the middle of the bouldering competition, during scoring for the finals -- has become one of the biggest spectator events of the gym's already popular four-part bouldering series. The last highline competition, in January, drew a big crowd, he said.

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