berider / tool for being a rider

There is gradually the increase in demand for bicycles, but still there are many people who can not ride a bike. Mainly as an adult learning to ride a bike is not easy. However, they could not find some proper tools, systems and there is no suitable place for it.
To catch balance on the bike is the most important task for riding a bike. Now you can practice the balance with berider.
Over time the distance of the wheels becomes narrower.