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Golf Swing Lesson Posture Mark Crossfield, PGA professional AskGolfGuru Mark Crossfield talks about posture and how it can make other movements in your golf swing much harder if you set yourself in a certain way. This is another golf swing sent through Mark’s iPhone, iPad and android golf app helping golfer from around the world play better golf. Improve your golf swing with easy to understand and follow golf tips and instructions from Mark Crossfield.