After suffering with arthritis in both knees for about two years, a knowledgeable dancer and physical therapist guided me to Gyrotonic exercise and to Sebastian Plettenberg.  She was right!  Within two or three weeks of practicing the basic spinal motions and the related leg/knee/feet exercises, I found that I had much less pain in walking.  During the past year, I have been amazed at the result of only 10-15 minutes of homework practice of these movements, combined with one or two private sessions a week with Beth Brandt.  I now walk easily and can do every-day movements without pain and the worry of further injury.  This is essential to me, because I am a musician in the New York Philharmonic.