If
you've ever taken lessons in guitar, rock climbing, or any other
activity that requires hand strength, you may have wondered how
to make your fingers
stronger. The answer: strengthen your palm and forearm. That's because
your finger doesn't actually contain any muscles, just tendons. These
tendons connect to 17 muscles in the palm of your hand and 18 muscles in
your forearm, which control the minute movements of your fingers
remotely. Add this to other weird facts about your muscles, such as how
they have memory, and you start to get a very bizarre picture of the
human body. 
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