> ## 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 Angle to Plate Release

> Trunk rotation angle relative to home plate at ball release.

## Technical Details

* **Variable Type:** Discrete Metric
* **Data Type:** Float
* **Units:** °
* **Column Name:** `trunk_angle_to_plate_release`
* **Aggregation:** mean
* **Precision:** 0
* **Measurement:** Trunk rotation (twist or transverse) angle at ball release
* **Reference:** 0° = facing home plate
* **Timing:** At ball release event
* **Typical Range:** -17 – -5 °
* **Optimal Direction:** Middle — moderate values are optimal

## Description

Trunk angle to plate release measures the trunk rotation angle relative to home plate at the instant of ball release, where facing home plate is 0 degrees.

## Normative Ranges

Percentile distributions by competition level from the 2026 Q1 dataset; the optimal range spans the 25th–75th percentiles.

| Population         | Optimal Range (25th–75th) | 10th | 25th | 50th | 75th | 90th |
| ------------------ | ------------------------- | :--: | :--: | :--: | :--: | :--: |
| Youth              | -18 – -3 °                |  -23 |  -18 |  -12 |  -3  |   5  |
| High School        | -16 – -5 °                |  -23 |  -16 |  -11 |  -5  |  -1  |
| College            | -15 – -6 °                |  -22 |  -15 |  -11 |  -6  |   2  |
| Professional       | -17 – -5 °                |  -25 |  -17 |  -11 |  -5  |   0  |
| Broad (All Levels) | -17 – -5 °                |  -23 |  -17 |  -11 |  -5  |   2  |

## Use Cases

* Trunk position assessment at release
* Rotation evaluation