Skills in Motion is a new fitness class that guides older people through playground games. There was a lot of whooping and hollering as a group of exuberant students gathered for recess time at Asphalt Green on the Upper East Side. They were playing a game called “popcorn.” “Listen up everyone,” yelled one of the instructors, Zack Cruz, to quiet the noise. “We are going to throw the ball in the air, clap one time, catch it, and then pass it to your neighbor. Everyone ready to go? Say yes!” One student crouched down. “We can do this,” she […]