It's ski joring!
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A horse and rider pull a skier (or snowboarder - rare to finish that way!) through a course.
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Course consists of 3 jumps mixed with a slalom course. So slalom, jump, land into the next gate, slalom, jump, into more gates, slalom jump, then kick it as hard as you can thru the last slalom gates to the finish. SUPER FUN to watch the pros. If you google Cody Smith You Tube Ski Joring... you can see what it's like from a Helmet GoPro.
