A staple move in boxing,the "Ali shuffle" is a rapid/fast way to get your heart rate up and give yourself a burst of cardio. exhaust this as a holding pattern between moves or as a stand alone to get a hastily exercise in anywhere, anytime.
Keeping your weight on the balls of your feet, or scissor your legs front and back.
This is rapid/fast footwork,and it should be light and hastily. Pump your arms to withhold the speed of the feet up in tempo.
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Source: popsugar.com