1. Here's what happens when you clench your fist.
2. And swing your shoulder.
3. When you bend your arm, your elbow joint does this.
4. Kicking your leg out straight looks like this.
5. And here's your ankle when you point and flex your toes.
GIFs by Cameron Jake.
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From original video footage by Dr Noah Weiss at Weiss Orthopedics.