Keep turning and shifting weight on pitch shots
On pitch shots, which use a smaller swing than a full swing, the speaker says the most common fault is failing to turn and shift your weight the way you would on a normal full swing, and instead swinging with the arms only and chopping down to try to gain speed, which produces fat shots. Her corrective is that even on the smaller pitch swing you still need to do a lot of turning and a lot of shifting your weight through.
Channel: Golf with Aimee
Watch official source at 0:39