I took private and then semi-private lessons at Pilates Northwest in north Seattle. I loved it. My workouts were on the machines (reformer, cadillac, wunda chair, barrel, and other equipment). I suggest a set of private lessons before doing mat classes. Learning how to control your core and how to duplicate those feelings in a mat class will go a long way in getting the results you desire.
I have never taken a mat class, but I have done the Winsor videos and I'm glad that I had a year of instructions on the machines. Look for a good teacher, as s/he can make each expnsive session worth the money.
Results: Stronger core and a different walk. I looked better, but I did not lose weight.
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