> ## 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.

# Elbow Slot

> When the rear elbow drops downward in preparation for the arm swing.

## Technical Details

* **Variable Type:** Event
* **Data Type:** Integer
* **Units:** Frame number
* **Column Name:** TBD
* **Required for QA:** False
* **Detection Method:** Hip shoulder separation (X Factor) velocity returns to 0 deg/s
* **Timing:** Must occur after X Factor zero crossing

## Description

End twist marks the completion of the twisting motion, indicated by when hip shoulder separation
(X Factor) velocity returns to zero, indicating the end of trunk rotation.

## Use Cases

* Arm positioning during the swing
* Transition from body to arm