To practice calligraphy, you must learn the proper way to hold the brush. This has much to do with the body's posture. You must hold the brush properly and also learn how to use your wrist and elbow while writing.
Body posture
Your posture while you write depends on the size of the characters you intend to write and your physical conditions. Proper posture will affect the speed of your progress and also your health. A contemporary calligrapher named Tang used the wrong posture, and though he became a calligrapher, he became a hunchback as well. He is called Tang the Hunchback.
What is the correct posture for writing? When sitting, the body should be erect, the shoulders balanced and the back straight. The legs should be apart, the feet evenly and firmly on the ground. The paper is held down by the left hand. The right hand holds the brush. The head is slightly forward, but be careful not to bow too low. Fix your eyes on the spot where you intend to write. Your eyes and the tip of your writing brush should be thirty centimeters apart. Your whole body should feel natural; do not pay undue attention to posture, or your body will become stiff or rigid. Correct posture simply prevents deformity of your body and enables you to write well. If you write characters larger than ten centimeters, you have to stand up and write. You may use any appropriate posture, depending on the situation.