Even though running is primarily a lower-body activity the hands control the tension in your upper body while the arm swing works in conjunction with your leg stride to drive the athlete forward. Keep hands in an unclenched fist, with your fingers lightly touching your palms. Arms should swing mostly forward and back, not across the body,between waist and lower-chest level. Elbows should be bent at about a 90-degree angle and can be trained with the playright supersleevetm.
Relay baton drill using the playright supersleevetm:
Two athletes stand facing the same direction in a straight line about 1 meter apart. Both runners stand in a slightly inclined position to imitate the sprinting posture. The back runner has a baton and holds it in a 90 degree elbow angle and makes a verbal call to the person in front who then holds out their hand to receive the pass with an outstretched arm palm up. After the person receives the baton, it should be shifted from the right to the left hand. Then the carrier pumps the arms, which should be bent at the elbows in a 90 degree angle, and imitates the arm action of a sprint without moving the legs. Do this 3-5 times and switch positions.