• Fully sitting down on the ground with legs stretched out in front of me to tie my shoes (if the ground is ok to sit on).
• Jumping down the last couple of steps of the staircase.

When you start to think about it there is no clear dividing line. For many people it is probably a degree of exclusivity. As in there being a degree of friendship you are only supposed to share with one single person. Goes out the window when you are any kind of non-monogamous of course.