> ## 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.

# Max X Factor

> Maximum amount of hip-shoulder separation before acceleration phase.

## Technical Details

* **Variable Type:** Discrete Metric
* **Data Type:** Float
* **Units:** Degrees
* **Column Name:** `max_x_factor`
* **Aggregation:** mean
* **Precision:** 0
* **Measurement:** Maximum rotational difference (separation) between hips and shoulders
* **Typical Range:** 18 – 31 °
* **Optimal Direction:** Higher is better

## Description

Max X Factor marks the amount of maximum separation between the hips and shoulders before the acceleration phase begins.
Hip shoulder separation is the rotational difference (twisting, transverse axis) between the hips (pelvis) and shoulders (trunk).

Max X factor indicates the maximum amount for pre-load range of motion prior to pitch delivery.
Increasing X factor provides more time and space for accelerating the ball.

## Normative Ranges

Percentile distributions by competition level from the 2026 Q1 dataset; the optimal range spans the 75th–90th percentiles.

| Population         | Optimal Range (75th–90th) | 10th | 25th | 50th | 75th | 90th |
| ------------------ | ------------------------- | :--: | :--: | :--: | :--: | :--: |
| Youth              | 29 – 32 °                 |  11  |  17  |  23  |  29  |  32  |
| High School        | 31 – 36 °                 |  15  |  19  |  26  |  31  |  36  |
| College            | 35 – 39 °                 |  14  |  22  |  29  |  35  |  39  |
| Professional       | 26 – 34 °                 |  10  |  14  |  20  |  26  |  34  |
| Broad (All Levels) | 31 – 36 °                 |  13  |  18  |  25  |  31  |  36  |

## Use Cases

* Core loading assessment