This past week was supposed to be a big one for Peloton Interactive Inc.’s small army of spin instructors. After six years of teaching their chic live-stream-classes from a studio in Manhattan’s Chelsea district, a new $50 million studio was set to open in the West Side’s Hudson Yards development.

Robin Arzón, a popular instructor,  taught class No. 1 in the new digs late Thursday morning. Throngs of people log into Peloton’s real-time cycling feed, and she spent considerable time beforehand mapping out her 30-minute “Together…

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