It only takes a minute to sign up. Connect and share knowledge within a single location that is structured and easy to search. Someone lying on their stomach, kicking their legs and feet up into the air behind them, looking sexy. The description should be pretty self-explanatory; just need a brief way to say it, preferably in as few words as possible. Lying on your stomach, facing down is called the prone position.
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Physics Stack Exchange is a question and answer site for active researchers, academics and students of physics. It only takes a minute to sign up. Connect and share knowledge within a single location that is structured and easy to search. Let's say someone jumps off an Olympic-sized diving board into a pool below so air resistance is negligible.
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Periodic limb movement disorder PLMD is a condition characterized by twitching, flexing, and jerking movements of the legs and arms during sleep. The movements typically occur every 20 to 40 seconds and may last for minutes or hours throughout the night. They often wake up tired and irritable. Some think it may be related to low iron levels or a problem with the nerves in the limbs caused by another condition such as diabetes.