star jump
US /ˈstɑːr dʒʌmp/
UK /ˈstɑːr dʒʌmp/

1.
a physical exercise in which a person jumps from a standing position with feet together and arms by their sides to a position with legs apart and arms raised above their head, resembling a star shape, and then returns to the starting position
:
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We started our workout with twenty star jumps to warm up.
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The instructor demonstrated how to perform a proper star jump.