Being in the zone, in the flow feels the same as being fully present. It’s not a place, Not something we do really. It's the state we fall into when we're in sync with our body -- survival, creativity, passion, awareness, things of life.
Our body remembers the gritty granular taste, touch and smell of being alive. It remembers the sensations and feelings of all that we do. Thus our body is the portal to the zone.
Our body remembers our core being before things were divided and made many. It thus serves as a portal to an undivided reality we know exists but cannot always see.