Understanding Your Swing Metrics: Knee Movement Explained

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Knee Movement measures your knee angles (in degrees) throughout backswing. 

Knee movement can help determine whether you are correctly utilizing the lower body during the first half of the swing.

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Lead Knee

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Top Angle

Measures the lead knee angle at the top of the backswing.

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Address-Top Delta

Tracks how much the lead knee extends or bends from address to the top of the backswing.

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Example

• If the top angle is 146.1°, and the description is “Slightly Large,” you may need to keep the lead knee bent a little more at the top.
• If the address-top delta is -3.6°, and the description is “Slightly Large,” your lead knee should bend more during the backswing.

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Trail Knee

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Top Angle

Measures the trail knee angle at the top of the backswing.

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Address-Top Delta

Tracks how much the trail knee extends or bends from address to the top of the backswing.

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Example

• If the top angle is 166.2°, and the description is “Slightly Large,” you may need to keep the trail knee bent a little more at the top.
• If the address-top delta is 22.4°, and the description is “Large,” you’re extending the trail knee too much during the backswing.

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Lead/Trail Delta

Tracks how the angle difference between the lead and trail knee changes from address to the top of the backswing.

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Example

If the lead/trail delta is 30.6°, and the description is “Large,” the angle difference between the lead and trail knee has changed dramatically from the address position to the top of the backswing. This typically occurs when your knees are over-activated during the backswing.