The most common problem with race walkers' shoulders is tightness resulting in high shoulder carriage. This also leads to a high arm carriage and due to your higher center of gravity could lead to a lifting call. In addition, tight shoulders could lead to cramps, making it difficult for you to maintain proper arm swing. Once your arms stop swinging, your hips are sure to follow. Once you lose your hips, you will be pedestrian walking the rest of the way.
Curt Clausen credits finally learning to relax his shoulders as the key to improving his arm swing and thus freeing up his hips. This technique improvement was a key factor in Clausen's bronze medal at the 1999 World Championships in Seville, Spain.
Focus on a low center of gravity. When your arm swings forward and back, focus on your elbows. Keeping your elbows down lowers your center of gravity and improves your arm swing.
The Reverse Windmill Stretch is a great way to warm up the shoulders and increase your range of motion at the same time.
Slowly perform this exercise while standing with your feet approximately a shoulder width apart. Your right hand is on your right shoulder, arm relaxed, elbow toward the ground. Your left hand is on your left shoulder, but your left elbow is behind your body.
When the body is cold, the Backward Windmill drill is a great way to get blood pumping to all extremities quickly. In addition, it helps to relax and stretch the upper body (specifically targeting the shoulders), leading to a more fluid arm motion.
Stand straight up with one arm at your side and the other pointed straight up to the sky.
A good stretch to add to your cool down is the Static Shoulder stretch. It helps to relax the shoulders after a walk and increase range of motion.
Perform this exercise while standing with your feet approximately a shoulder width apart.
Tight neck muscles lead to high shoulders and a higher center of gravity, and thus loss of contact. If only one side is tight, your head could tilt to one side.
This stretch can be accomplished from either a seated or standing position.