> ## Documentation Index
> Fetch the complete documentation index at: https://docs.uplift.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Early Extension

> Binary indicator of early extension — the pelvis moves toward the ball (target line) by more than 10 cm during the swing, a common power-and-consistency fault.

## Technical Details

* **Variable Type:** Movement Flag
* **Data Type:** Integer
* **Units:** N/A
* **Column Name:** `early_extension`
* **Optimal Direction:** Lower is better
* **Unknown Value:** -1
* **Measurement:** Derived from the Loss of Posture Pelvis direction component
* **Threshold:** Mid-pelvis position moves more than 10 cm (0.1 m) toward the ball (Z-axis) between P1 Address and P7 Impact

## Description

Early Extension flags a golfer whose pelvis thrusts toward the ball during the downswing rather than continuing to rotate in place. It is derived from the [Loss of Posture](/biomechanics/activities/golf/swing/flags/loss-of-posture) pelvis-direction breakdown, specifically when the flagged displacement occurs along the Z-axis (toward the ball).

## Use Cases

* Posture fault detection
* Power leak identification
* Injury risk screening