When San Francisco CrossFit co-founders Kelly and Juliet Starrett reopened their gym outdoors this summer, they had to adapt the handshakes that usually start each class for the pandemic. Handshakes were verboten, of course, but members of the city's first CrossFit gym — one of the first two dozen or so worldwide — would tap elbows or wave before the workout began, a small gesture that spoke to a larger culture of inclusion and community.