> ## 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.

# Release

> Estimated timing of ball release during the softball pitch.

## Technical Details

* **Variable Type:** Event
* **Data Type:** Integer
* **Units:** Frame number
* **Column Name:** `ball_release_frame`
* **Required for QA:** True
* **Measurement:** Low hand event plus a fixed 3-frame offset, calibrated against ground-truth release timing

## Description

Release marks the estimated instant of ball release during the windmill delivery, computed as a small offset from the low hand event.

## Use Cases

* Ball release timing analysis
* Downstream release-based metrics (wrist height, trunk angles, arm slot)