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Because different yoga poses set up various patterns of breathing and physiological action, postures are invitations into the psychological and physiological webs that form the matrix of the mind-body. Posture sequences open up different layers and movements of mind and body and thus work on the sheaths of mind and body in distinct ways.
... See moreMichael Stone • The Inner Tradition of Yoga: A Guide to Yoga Philosophy for the Contemporary Practitioner
As you might surmise, yoga involves a lot of isometric effort. Whenever you hold an active asana, your muscles must engage isometrically. Maintaining upright posture throughout the day is also an isometric effort. Transitioning in and out of poses, however, requires concentric and eccentric efforts of various muscles.
Andrew McGonigle • The Physiology of Yoga

I cue through starting with Tadasana and have my clients lift their internal arches while rooting through the triad in the feet. Then, begin yin breathing with an inhale up the insides of the legs, drawing the breath up the front of the spine to the top of the head, then exhaling down the SBL.
Kirstie Bender Segarra • Myofascial Yoga: A movement and yoga therapists guide to asana

B.K.S. Iyengar Yoga The Path to Holistic Health: The Definitive Step-by-Step Guide
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As we move in and out of poses in union with the breath, we may experience a sense of seamlessly joining our inner world of experience with the external world of perception and our interactions with others. As we do, the practice takes on a deeply meditative quality.
Mary Taylor • The Art of Vinyasa: Awakening Body and Mind through the Practice of Ashtanga Yoga
