Letting in: life, opportunities, people, places, situations, emotions, realities (not the way I want or imagine them to be), deep breath, ideas (without judgement or evaluation), truth, the moment, the 'good,' the what is, 'all things'. That is where life begins for me.
Richard Rohr writes in Breathing Underwater, "...surrender is not a 'giving up,' as we tend to think, nearly as much as it is a 'giving to' the moment, the event, and the situation" (p.19).