> ## 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.

# Loading Phase Lack of Pelvis Drop

> Binary indicator if the pelvis does not sufficiently tilt/drop during the loading phase.

## Technical Details

* **Variable Type:** Movement Flag
* **Data Type:** Integer
* **Units:** N/A
* **Column Name:** `loading_phase_lack_pelvis_drop`
* **Optimal Direction:** Lower is better
* **Unknown Value:** -1
* **Measurement:** [Loading Phase Pelvis Tilt](/biomechanics/activities/tennis/metrics/loading-phase-pelvis-tilt)
* **Threshold:** Pelvis tilt greater than 0°

## Description

Loading phase lack of pelvis drop is a binary indicator that flags when the pelvis does not tilt sideways toward the rear during the loading phase, which reduces the hip-over-hip tilt used to load the serve.

## Use Cases

* Loading posture assessment
* Mechanics evaluation