Skyrunner is defined mainly by a flat spring controlled upon deformation, so that the result is a straight movement relative to the ground. With the riser's functional principle, depressive spring characteristic and backward movement of the force point during deformation are achieved. This supports the natural force point movement in the heels direction at higher loads and allows the runner to transpose his optimal jumping energy. Hence, you can really fly 1. Selection of Skyrunner Model--Select a model according to the weight and age of the user. 2. Is it hard to play?-- No, it is easy to use. If you have basic athletic sense, you can walk after 10 minutes of use. You may feel that it is easier than what it looks like. Balancing on Skyrunner is the same as in walking. 3. How about the exercise intensity or scope?--Skyrunner is an all-body fitness machine.It helps you with aerobic exercise but also strengthen your muscles. It strengthens all body muscles, including not only the leg muscles but also the upper body muscles and abdominal muscles. 4. Isn't it dangerous?---It is not dangerous if you do not use it excessively.Like any other fitness machine, you should fully understand how to use Skyrunner before you start to use it. In addition, be sure to wear protective devices such as a helmet and knee pad. Skyrunner is a jump stilts; you need not be afraid of falling or becoming injured. Skyrunner is easy to use; it’s as if you are just walking or jogging. Once you get used to the basics, you will not fall. 5. Can my joints or muscles be injured?---Absolutely no.The fiber glass spring absorbs shock up to 2m jumps with its spring elasticity, protecting joints such as the knees from injury. 6. Where should Skyrunner be used?---Use it on a broad, flat and strong ground.Avoid using it in places that have plenty of automobile traffic and places that are wet or slippery. In addition, do not use on a bumpy, soft, inclined place.