Initially, young players tire quickly, since their arms and wrists are weak. They often have difficulty lasting for one minute. The hands and wrists remain loose. Movement is forward and back, not sideways. The elbows, if bent, point forward.
Young players make every possible mistake.
You need to work individually with each player. Wrist problems also hamper passing and dribbling. Use of Assistants Assistants look for bent elbows and tight hands. Everyday Extensions Practice this every day of the season, especially before shooting lessons. Players recognize the benefits immediately.