> ## 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.

# Max Trunk Flexion

> Max forward trunk flexion angle near pitch initiation.

## Technical Details

* **Variable Type:** Discrete Metric
* **Data Type:** Float
* **Units:** deg
* **Column Name:** `max_trunk_flexion`
* **Aggregation:** mean
* **Precision:** 0
* **Measurement:** Max forward trunk flexion relative to global vertical
* **Timing:** Within a 0.25 s window centered on the initiation event
* **Optimal Direction:** Middle — moderate values are optimal

## Description

Max trunk flexion measures the maximum forward-flexed angle of the trunk relative to global vertical near the initiation event, which reflects how far the athlete bends forward at the start of the pitching motion.

## Use Cases

* Initiation posture assessment
* Mechanics evaluation