SNOWBASIN -- At age 16, the only ill effect Patrick Pehrson was feeling after a long day of skiing was some mild soreness in his knees.
For his father, Rex Pehrson, it was a slightly different story.
"It beat me up," Rex Pehrson said. "My three kids all outskied me today."
For the Pehrsons and many others, the last Tuesday of February has become something of a tradition. It's the day every winter that Snowbasin hosts the Bob Aamodt Vertical Challenge, essentially the skiing equivalent of a marathon in which participants spend six hours skiing as many vertical feet on the slopes as they can muster.
Event founder and namesake Bob Aamodt, the owner of Knox Capital Group in Farmington, said he got the idea several years ago while brainstorming about how to stage a different type of corporate-sponsored event.
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