Throwing a Water Polo ball uses
no one plays water polo
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All of them. You use your knees to bend, your shoulders, elbows, wrists, everything.
The main joints that are used to catch a ball are found in the fingers, wrists, elbows, and shoulders. Every other joint in the body may be used to catch a ball depending on how you catch it.
It is the whole arm that is used so the ball in socket joint will be the main contender for the swing but the hing joint (elbow) will bend as you do your thing ;-)
Basically all the joints in the body have a function in this. However, the main joints are spine, shoulders, neck elbows, writes finger/hand