lying stiil, meditating and praying sounds ideal. But there is praying and meditating, and then there's lying still, as
if it is some form of punishment or self-denial. It's probably not within the realm of possibility for most people.
Also, lying still with eyes closed in a joyless place without fresh air might be not so great. A little sun is good, as is breathing clean air, maybe even a gentle walk...