"The outward man is the swinging door; the inner man is the still hinge."
~ Eckhart ~
Productivity is about yielding positive results. There is a certain surrendering built into it, and it isn't necessarily accomplishment specific. Productivity is more experiential than that. To have a certain grounded balance within- that's productivity: to not hamper ourselves with guilt or dysfunction or faulty patterns of behavior. When we feel good, we do good, and we experience life as good. And so, if we look at it in this way, then the ultimate root of productivity is proper self-care.
I do right by myself and experience well-being and good living as a result.