Why is this series of discourses called 'Walking in Zen, Sitting in Zen'?

According to Osho, the title comes from Zen master Yoka’s insight that a true man of Zen walks and sits in Zen, because meditation is not a fragment but a 24-hour way of being, like breathing. Zen means objectless, silent awareness (dhyan) permeating every act—walking, sitting, speaking, even dying. The series points to meditation as the soul’s climate, an unbroken presence rather than occasional practice or concentration.