When the deltoids contract, they raise your arms. They are also used to rotate the shoulders.
When raising your hand for a high five, reaching over your head to grab a rebound, or doing the chicken dance, you are using your deltoids. Also, deltoids can produce the rotating motion necessary for throwing a baseball or a football.
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Despite being a powerful mover of the arm and shoulder, the deltoid is relatively small, weighing less than 1/2 a pound.