The normal position while standing on the Sonic plate is that your knees should be locked to help radiate the frequency to the upper parts of the body, shoulders, head, face, etc. However, if you are experiencing any cramping, pain, or tension in your calf area, or any fluid retention in your calf or ankle area, try slightly bending your knees with the unit at 7-8-9-or 10 Hertz. I usually keep my unit in the manual mode, full power and just vary the frequencies. At 8 Hertz, full power, knees slightly bent, your calves, ankles and feet will get the ride of a lifetime. Sometimes, if my calf area is feeling a little tight, I’ll run a full 10-minute session in that position. Give it a try and let me know how it goes.