Which of the following is NOT a physical factor affecting a golfer's swing?

The length of the club is considered more of a technical factor rather than a physical factor that directly pertains to a golfer's body. While the length of the club influences how a golfer can position themselves and how the swing is executed, it does not pertain to the golfer's personal physical attributes. In contrast, flexibility, posture, and balance are inherent physical attributes or conditions that can significantly impact the golfer's ability to execute a proper swing. Flexibility involves the range of motion in the joints and muscles, posture affects alignment and stability during the swing, and balance is crucial for maintaining an effective stance and executing a controlled swing. Thus, understanding the differentiation between equipment specifications, like club length, and personal physical factors is essential for analyzing how these elements interact in a golfer's performance.