motusVB will cause no discomfort if positioned and worn properly. It is designed to be worn on the top of the wrist, out of the way while setting the ball or diving to the floor.
Please note that when you perform repetitive activity such as swinging activity, you may experience occasional discomfort or fatigue. Take frequent breaks while using your motusVB if you experience discomfort and do not resume your swinging activity until the discomfort disappears. If the discomfort does not disappear, consult a physician.