Mark Zuckerberg practicing jiu-jitsu is an example. Gym participation is a luxury display of leisure time. I wonder why he didn't take up golf. There seems to b

Mark Zuckerberg practicing jiu-jitsu is an example. Gym participation is a luxury display of leisure time. I wonder why he didn't take up golf. There seems to be a trendy desire to leisure train physical fighting ability as opposed to other recreational activities.