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iPhone Golf Lesson Swing Plane with Mark Crossfield PGA Golf Professional. Mark helps more golfer from around the world with his iPhone app golf lessons. This is a swing plane lesson where the twee golfers both swing the golf club under plane and then come out of their postures through impact causing poor strikes and off line golf shots. The basic tips and drills that mark is using in this golf instructional video can work both for irons and drivers. Improve your golf with Mark Crossfield today and AskGolfGuru.com