You can find this exercise on page 97 of the book Synergistic Golf.
Exercise Type: CARDIO
Exercise Category: CARDIO, LEGS - FEET, RHYTHM - TIMING
To ensure you have the correct length jumprope, stand on the rope with both feet. Handles should come up to shoulder level when pulled at your sides. Practice jumping lightly on both feet. Beginners will focus more on the coordination of the jump. As you progress, increase your time.