 The purpose of this study is to learn about the twisting or wringing motion of the heartbeat called torsion which can be seen on ultrasound. This study will help figure out if there is a difference in the how a heart twists at rest and with exercise in people with normal hearts compared to people with HCM abnormally thickened heart muscle. Volunteers will have an echocardiogram ultrasound of the heart while lying on a bed both at rest and while peddling a wheel located at at the foot of the bed. The patients will take about 1 to 1 12 hours total and the study will be complete after this procedure. 