Rope jumping trick in which you turn the rope as fast can?

The double under is a rope jumping trick in which the rope passes under the jumper's feet twice during a single jump. It is considered one of the most basic and fundamental tricks in rope jumping, and is often used as a warm-up or as a way to increase speed and coordination.

To perform a double under, start by standing with the rope behind you, holding the handles in both hands. Swing the rope forward and jump over it, then quickly swing the rope back under your feet and jump over it again before it hits the ground. Continue this motion, alternating feet and swinging the rope in a continuous rhythm.

The key to performing a double under is to keep the rope moving quickly and to jump at the right time. The rope should be moving at about the same speed as your legs, and you should jump just as the rope is about to pass under your feet. If you jump too early, the rope will hit your feet; if you jump too late, the rope will pass over your head.

With practice, you will be able to perform double unders consistently and at high speeds. Double unders are a great way to improve your coordination, speed, and endurance, and they are also a lot of fun!