To know 'body as body' is the invitation of the first foundation of mindfulness. Coming to a wise relationship with our body which neither glorifies nor rejects our body we can begin to know body as a vehicle for profound wisdom.
An analysis of the Buddha's account of his awakening in the Discourse on the Noble Quest (M. 26) as an existential shift from attachment to a 'place' to the seeing of the twofold 'ground' of conditioned arising and nibbana, followed by a psychological interpretation the subsequent passage which describes how, inspired by the god Brahma, he set off to teach his first sermon in Isipatana (Sarnath).
Reflections on the Buddha's first sermon: how the four noble truths are a translation of the principle of conditioned arising into a way of life; the middle way as avoiding the two dead ends of worldliness and religiosity; the four truths as prescriptions rather than descriptions, as a sequence of tasks to perform rather than a set of doctrines to believe; the first truth as fully knowing dukkha both in depth and breadth.
Sometimes we long for stillness and for all activity to come to rest. Sometimes we long for movement and can't bare to be still any longer. In using the practices of stillness and movement of body we start to study this dynamic, and we see the inner life of stillness and movement and how suffering arises through not fully understanding this play: either we get hooked into the things that move because they catch our attention, or we want to reject them for the same reasons. Coming to a wise relationship with stillness and movement brings more rest in a world of things that move.