You absolutely can surrender to the flow and be carried forward by life without control. You also can absolutely make a choice to participate and maybe even take charge to some degree in the navigation and direction. But you literally can just be, and let your body and body and system do it's hing, breathe and function. When you are thirsty you can get yourself a glass of water. When you are hungry you can eat. When you need to go to the bathroom but you have to wait for the car to stop you might exercise some self-control and not pee in your pants. But ultimately you can just be. You can observe. Take note. Feel. Breathe. Allow for what is to be felt and move through your system, releasing being in control and letting the intelligence that is your system and psyche breathe itself out of stagnated encaptment and dissolve stuckness, repression, and constriction.