The pose, called "postural expansiveness", basically refers to how much space you take up with your torso and limbs.
www.independent.ie They may include, but are not limited to, diplopia (double vision), asthenopia (eye strain), transient blurred vision, difficulty sustaining near-visual function, abnormal fatigue, headache, and abnormal postural adaptation, among others.
en.wikipedia.org In most cases, this leads to some postflight postural illusions.
en.wikipedia.org Proper positioning of the body is key, including postural alignment for proper drainage of mucous secretions.
en.wikipedia.org Subjective improvements were reported by the subjects regarding postural comfort.
en.wikipedia.org