> ## 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 Tilt at Launch

> Amount of side-to-side trunk tilt at launch event (pelvis velocity initiation). Positive values indicate tilting towards the pitcher and vice versa.

## Technical Details

* **Variable Type:** Discrete Metric
* **Data Type:** Float
* **Units:** °
* **Column Name:** `trunk_tilt_at_launch`
* **Aggregation:** mean
* **Precision:** 0
* **Measurement:** Side-to-side trunk tilt
* **Timing:** At launch event
* **Typical Range:** 5 – 13 °
* **Optimal Direction:** Middle — moderate values are optimal

## Description

Trunk tilt at launch measures the side-to-side tilt of the trunk at the moment of pelvis velocity initiation, indicating trunk posture and balance at the start of power generation.

## 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              | 5 – 14 °                  |   3  |   5  |   9  |  14  |  16  |
| High School        | 5 – 14 °                  |   1  |   5  |  10  |  14  |  18  |
| College            | 7 – 14 °                  |   3  |   7  |  10  |  14  |  16  |
| Professional       | 4 – 12 °                  |   0  |   4  |   9  |  12  |  14  |
| Broad (All Levels) | 5 – 13 °                  |   1  |   5  |   9  |  13  |  16  |

## Use Cases

* Trunk posture analysis
* Launch position evaluation