"I remember exactly what I was wearing, I remember exactly who was in the class, and I remember how hard I cried," said Colleen Saidman Yee of Yoga Shanti of the day in March 2020 when she closed her Sag Harbor yoga studio because of the pandemic. After barely surviving a 15-month shutdown, Yoga Shanti in Sag Harbor is seeking to regain its footing with new protocols designed to make students breathe easy about returning to group classes.