Flow is essentially an out-of-body experience created when consciousness and behavior are united. When one is in the “zone,” all your actions become so synchronized that even though you think you are in full control, your body is essentially carrying itself. When you pour all of yourself into a given activity (work, art, sport, etc.), to the point that you are physically and mentally conscious of all aspects involved while disavowing the ego, natural harmony will occur and you suddenly experience pure joy! Within such a state, life opens up through experiencing the interconnected nature and energies of all things.
Separate from the SELF to transcend the BODY.
You cannot will a flow to happen- subconsciously you are there. Everyone experiences flow differently in a context that is personal to them.