I wanted to ask a number of questions about meditation posture that I've been wresting with over the last few weeks:
1) Turning head: has anybody experienced their head turning to one side during meditation, or leaning back? In almost every session, my head begins to turn left, and sometimes it leans back. Sometimes I would leave it there, and sometimes I align it straight again.
2) Open eyes and nimitta: when I first started to meditate about a year ago, my eyes would be closed for the whole session. Then at some point they started opening, and now they are open half-way from the beginning into the whole session every session. I have tried to force them closed, but the strain becomes a substantial distraction. Since I consistently enter access meditation without entering the first jhana, I wonder if that's because the open eyes prevent arising of the nimitta (which I haven't really experienced yet).
3) Chair: Due to a weak and inflexible back. I have struggled to meditate without back support, and currently only meditate while sitting on a chair. Would you recommend training the back for strength and flexibility to enable sitting without back support, or is meditation on a chair "good enough" for life? I am 32 years old and am looking to develop a posture that can last a lifetime.
"I do not perceive even one other thing, o monks, that when developed and cultivated entails such great happiness as the mind" (AN 1.10, transl. Ven. Bhikkhu Bodhi)
"So this spiritual life, monks, does not have gain, honor, and renown for its benefit, or the attainment of moral discipline for its benefit, or the attainment of concentration for its benefit, or knowledge and vision for its benefit. But it is this unshakable liberation of mind that is the goal of this spiritual life, its heartwood, and its end," (MN 29, transl. Ven Bhikkhu Bodhi)