[Mathew]

Scooping is usually the cause. Keep your left shoulder moving.

When the left arm and clubshaft are in a straight line - the primary lever assembly is at its most extended state. When the left wrist bends - the clubhead arc or circle around the left shoulder center becomes reduced and therefore hitting fat is not caused by scooping. Very often the golfer with severe downwards 'bobbing' will scoop to reduce his clubhead orbit to stop hitting it so fat because his computer tells him that his clubhead orbit would probably bury the clubhead in the ground but the main culprit however was the head position.