The most successful social leisure activities share two traits. First, they require you to spend time with other people in person. As emphasized, there's a sensory and social richness to real-world encounters that's largely lost in virtual connections, so spending time with your World of Warcraft clan doesn't qualify. The second trait is that the activity provides some sort of structure for the social interaction, including rules you have to follow, insider terminology or rituals, and often a shared goal. As argued, these constraints paradoxically enable more freedom of expression. Your CrossFit buddies will holler and whoop, and give you emphatic high fives and sweaty hugs with a joyous enthusiasm that would seem insane in most other contexts.