The swing's plane has the most influence on solid contact. A description of the ideal shape of the golf swing as it travels from start to finish, the plane is determined by the golf club's shaft angle as it sits at address. For example, a five-iron sits at roughly 45 degrees to the ground. Steep players swing too vertically relative to the ideal angle hitting fat shots, toe hits, pulls and slices. Flat players swing too horizontally relative to the optimum angle hitting top shots, heel hits, pushes and hooks.
Most golfers tend to fluctuate through both flat and steep positions throughout their swings.
This type of inconsistent shape leads to compensating motions and inconsistent contact. Athletic Left Arm One of golf's biggest myths is that you need a straight left arm to play well. I often see players with a left arm that is way too tense and rigid. I like to see what I call an athletic left arm . The arm should be relatively straight and supportive with a slight rounding, but not stiff.