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Lying down is slower than sitting, because of pressure differences in the carotid sinus. Sitting is slower than standing, because of pressure differences in the legs and thighs.
When you exercise, you refresh your body, which helps the back and legs to perform better posture.
Generally on four legs. Upright posture is not for moving.
Prolonged viewing of a monitor, especially older CRT monitors, can cause eye strain and headaches. There are no known long-term affects on your vision or health.
a turtle
Sitting like that in itself doesn't have to mean anything. It's a posture that subconsciously expresses willingness for a relationship, but nothing else. It is just a comfortable position to be sitting iif you are on a chair. If you both are on the floor and he is behind you with his legs on either side of you, he is looking for a way to connect with you. Scoot back and rest on his chest and see what he does. Usually guys will then wrap their arms around you or rub your back or arms, or talk in your ear. This is a good thing.
Generally on four legs. Upright posture is not for moving.
40 legs
A backless chair is a type of chair that does not have a backrest. It requires the person sitting on it to have good posture to maintain balance and support themselves. Backless chairs are often used for short periods of time or for specific activities like playing music or art.
swinging the legs when sitting
Your spider may be dying or dead, because spiders die with their legs curled up. Or maybe it is because there is no more hydraulic pressure in their legs. (Hydraulic pressure is what is used for spiders to jump, move their legs, etc.) Not sure about the abdomen thing though, sorry.
It is tacky to cross your legs when sitting down at a wedding. It is also tacky at a funeral because of the body language it shows.