When a golf instructor suggests a bent left knee, which aspect of the PGA swing model does it refer to?

The suggestion of a bent left knee by a golf instructor refers specifically to the aspect of "Preference" within the PGA swing model. This is because "Preference" encompasses the individual techniques and styles that a golfer may adopt based on their comfort, flexibility, and personal approach to the game.

In this context, the instructor is recommending a physical adjustment that can help the student find a more effective and comfortable posture during the swing. This type of guidance acknowledges that different golfers may have varying preferences for their stance and swing mechanics, allowing for personalized adaptation to the swing technique. The bent left knee can help promote balance and stability, tailored to the unique characteristics of the player, further emphasizing the individualized nature of "Preference" in the swing model.

Other aspects like "Dynamics," "Law," and "Principle" refer to broader, more universal concepts about how the swing works, providing a framework or set of guidelines rather than specific adjustments tailored to a golfer's individual needs. Thus, the recommendation of a bent knee falls within the realm of personal choices and adaptations that enhance a golfer's performance.