Shelly Sheridan teaches a Zumba class, March 30, 2020, in the garage of her Harborcreek Township home in Erie, Pa. Sheridan, 55, has been an instructor at the YMCA of Greater Erie for the past 30 years. Sheridan gets help from her twin daughters in setting up a laptop web cam on a trash receptacle, foreground, then runs a 30-minute workout for up to about 30 people tuning in to the live webcast. "Exercise is not just a physical thing. It's also a mental thing," said Sheridan.