There is something about being human that people walking in a group tend to end up walking in lockstep. Not a military marching level of synchronization, but f

There is something about being human that people walking in a group tend to end up walking in lockstep. Not a military marching level of synchronization, but far more regular than random. I first noticed myself doing it as a child and since then have become very aware of it happening around me. It is a stronger effect if the people know each other and are having a conversation, but it may well be that if most people have their noses buried in a phone it happens as well - maybe audio plays a part and subconsciously hearing footsteps they sync up their footsteps.