jumping jack
US /ˈdʒʌmpɪŋ dʒæk/
UK /ˈdʒʌmpɪŋ dʒæk/
1.
an exercise in which you stand with your feet together and your arms at your sides, then jump to a position with your legs spread wide and your arms extended overhead, and then return to the starting position
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We started our workout with 20 jumping jacks.
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Doing jumping jacks is a good way to warm up.