> ## 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.

# Trunk Center of Mass Position Y

> Trunk center of mass Y position (up/down) - for use with keypoint positions. This is a time series metric that tracks the trunk's vertical position throughout the swing.

## Technical Details

* **Variable Type:** Time Series Metric
* **Data Type:** Float
* **Units:** meters (m)
* **Column Name:** `trunk_center_of_mass_y`
* **Aggregation:** mean
* **Precision:** 3
* **Optimal Direction:** N/A
* **Type:** Time series metric
* **Direction:** Vertical (up/down)

## Description

Trunk center of mass Y position tracks the vertical position of the trunk's center of mass throughout the swing, providing insight into trunk movement patterns and stability.

## Use Cases

* Trunk vertical movement analysis
* Position tracking