The second limb is the hand with its fulcrum at the wrist. The hand can move up and down at the wrist, but this fulcrum, as well as the fulcrum at the hand knuckle must never collapse or the whole system will collapse. The system consisting of the fingers, hand, forearm and upperam is the system that is used to set the key in motion.

The up and down movement of the hand at the wrist is useful in shaping a phrase and coordinating movements that involve the finger and arm as used with followig:

1. the scale,
2. arpeggios,
3. double thirds

when the fingers remain close to the keys.
The movement of the hand from the wrist that involves a stationary wrist and the fingers and hand swinging up and down from a distance above the keys is destructive if done for any length of time. It is a similar motion to that of the thrusting finger, therefore it incites a dual muscular pull, which in turn leads to fatigue, cramp, or pain.

The movement of the hand sideways from the wrist is a movement to be avoided, for it creates an angle with the forearm, a line that should always remain straight and not twisted. The fingers need to be aligned with the flexors and extensors of the forearm to enable their optimal functionality.
When the wrist becomes twisted , it causes a dual pull between the abductors and the adductors, causing tension and incoordination. This is to be avoided and instead there should be balance and freedom. Wrist abduction and adduction, depend upon the extensor-flexor position of the wrist.