> ## 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

> The estimated time of ball release during the pitch.

## Technical Details

* **Variable Type:** Event
* **Data Type:** Integer
* **Units:** Frame number
* **Column Name:** `ball_release_frame`
* **Required for QA:** True
* **Measurement:** Estimated timing of ball release

## Description

Release marks the estimated instant when the ball is released from the pitcher's hand, representing the end of the acceleration phase.
Detected via one of 3 methods:

1. peak wrist velocity in the horizontal axis
2. peak wrist height
3. peak elbow extension angle

## Use Cases

* Arm slot angle
* Pitch completion & timing