Full Definition
Knee flex at address: 15-20 degrees is optimal (slight athletic bend, not a deep squat). Too much flex restricts hip rotation. Too little flex limits ground force access. During the swing: the trail knee maintains flex in the backswing (resists sway), then extends in the downswing as power fires upward, and the lead knee maintains flex through impact before extending in the finish. The squat move — a temporary deepening of knee flex at transition — is common in elite players for additional ground force. GOATY lower body tracking measures knee flex patterns throughout the swing.
See How Knee Flex Affects YOUR Swing — In Real Time
GOATY AI watches your swing live through your camera, speaks coaching cues in your ear while you swing, and measures the exact biomechanics — including knee flex — that determine your ball-striking quality.
Try a Free Live Lesson with GOATYor upload a swing for instant analysis
GOATY lower body tracking measures your knee flex pattern — identifying whether you are producing and utilizing ground force correctly. Book a free live lesson to see your own knee flex data in real time during your practice session.
Frequently Asked Questions
What is Knee Flex in golf?
The degree of bend in the knees at address and throughout the swing, which affects posture and ground force production.
Why does knee flex matter for scoring?
Knee flex at address: 15-20 degrees is optimal (slight athletic bend, not a deep squat). Too much flex restricts hip rotation. Too little flex limits ground force access. During the swing: the trail knee maintains flex in the backswing (resists sway), then extends in the downswin...
How can I improve my knee flex?
GOATY lower body tracking measures your knee flex pattern — identifying whether you are producing and utilizing ground force correctly. GOATY AI measures your knee flex in real time during live practice sessions — giving you instant feedback without needing to film and review video after the fact.
What is a good knee flex for an amateur golfer?
The benchmark is the GOAT Model — elite swing mechanics scored at 97.3. GOATY AI shows you exactly how your knee flex compares to this elite standard and coaches you toward it session by session.