On a Thursday morning in July, JaMarcus Coates, 10, bounced off four-angled yellow platforms onto a rectangular swing. “The last part’s hard,” he said, referring to the suspended net cargo bags, which ...

Jeremy Lauff didn't want any part of the other summer activities his parents came up with, so he tried a ninja class. Emerson Hebel was bored one night after soccer season, so she asked her dad to ...