Do not ignore the fact that the 'Koala Challenge' was started by fitness couples aka us regular folks shouldn't attempt this unless we wanna get hurt
The 'koala' person starts out hanging off the front of you. Then without touching the ground, they have to climb the whole way around your torso . . . up over your shoulders . . . down your back and through your legs . . . and then end up hanging off the front of you again.