"Spine" is a wpord for the collection of bones down your back, in the middle, not your ribs. . "Posture" decscribe how you stand, sit, lie, What shape your body forms. For example slouching is considered a bad shape, poor posture. . Poor posture, also affects you when you are asleep. It implies that you should have good posture when you sleep.

"Comes into play" means a piece of information is now relevant (which previously wasn't), or a piece of information that couldn't previously be used can now be used. Examples: "It's time for the first part of the plan to -come into play-" "A variety of factors -come into play- when hiring an employee" "Personal feelings should not -come into play- when making an important business decision"

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What does what mean?