What are the tips for playing various repertoire with guzheng?

In the process of practicing fast techniques, one must master the key point of relaxation, only when the muscles of the shoulder, arm, elbow and wrist are fully relaxed can all the power be concentrated to the fingertips. If any part of the tension, the power in the process of sending to the fingertips, will be weakened, at the same time restrained the flexibility of the fingers. It is like a clear spring coming down from above and suddenly being cut off halfway.