Personal Trainer : Weight Training : Bhasinsoft

The hands should be stretched out at shoulder level and moved in a circular motion, first clockwise and then anti-clockwise in a slow and controlled manner.
Arm Rotation warms up your shoulder muscles and upper back muscles along with the base of neck.
Warming up of muscles is very important for ensuring that the body is ready for weights and exercises and to prevent injuries by reducing stiffness of the body.