there is sharing of mutual goals, vision, and plans, and everyone works together to realize them
This goes hand in hand with the last thought. You must be traveling in like directions or you will pull each other off course. If you ARE traveling in like directions, then you can support one another in going there more easily and quickly. Like bikers in races, teammates will take turns riding in the "wind" that draws them forward just behind the other rider so everyone gets a "break" and they are all able to go faster because of it.