San Jose resident Jim Challas only needs three things to play his favorite outdoor game: a green space, a sunhat and — most important of all — a plastic disc.

On a recent windy May day, Challas pulls several of them out of the trunk of his car at Kelley Park in San Jose. He lines them up on a nearby picnic table, each sporting a different color and size, and describes their unique functions.

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“This one’s just excellent for slicing through the air,” Challas says, holding a small, translucent disc in his hands.

But the 73-year-old isn’t going to aimlessly toss the disc into the park’s landscape or towards someone’s awaiting hand. Instead, his eyes fixate on an elevated metal basket stationed hundreds of feet away from the table. Challas carefully positions his body toward

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