As temperatures hovered above freezing in Chicago Wednesday morning, nine people gathered in front of infrared heaters at the loading dock at Edge Athlete Lounge, in the West Town area, for a full-body strength routine that finished just before sunrise. Others followed a livestreamed version from home. But Cary Black, 41, a longtime Edge member training for two 100-kilometer ultramarathons, said he prefers being with the group and getting face-to-face instruction — as long as it’s above 10 degrees. “I feel like I go a little harder,” he said. “I get a better start to the day.” New Year’s resol…
