Among Cathy White’s rules: If Shaun, his brother and sister wanted mom to accompany them down the mountain, they had to ride “switch” — backward — so she could keep up. By the end of the season, I was so proficient at riding switch. It’s as difficult as it is underappreciated by casual viewers or people who’ve never tried it. Maybe Kelly Clark, the 2002 Olympic halfpipe champ who added bronze medals in 2010 and 2014, put it best. Most of those will involve riding switch or spinning in an unnatural way.