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“Double-unders require the athlete to propel the body upward and lift the feet up to several inches from the ground while making small, fast circular movements with the wrists in order to execute multiple turns of the rope with each jump. They develop dynamic balance, speed, quickness, agility, coordination, concentration, and cardiorespiratory efficiency.“ —Buddy Lee, “Jump Rope Basics, Part 2“ (adapted) CrossFit® - Forging Elite Fitness® ()
