> ## 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.

# Hip Hinge

> Max amount of rear hip flexion between max foot raise and foot contact events.

## Technical Details

* **Variable Type:** Discrete Metric
* **Data Type:** Float
* **Units:** °
* **Column Name:** `hip_hinge`
* **Aggregation:** mean
* **Precision:** 0
* **Measurement:** Max rear hip flexion
* **Timing:** Max foot raise to foot contact
* **Typical Range:** 51 – 64 °
* **Optimal Direction:** Middle — moderate values are optimal

## Description

Hip hinge measures the maximum amount of rear hip flexion during the stride phase, indicating the loading and preparation of the rear hip for 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              | 48 – 60 °                 |  42  |  48  |  54  |  60  |  68  |
| High School        | 50 – 63 °                 |  46  |  50  |  55  |  63  |  70  |
| College            | 54 – 69 °                 |  49  |  54  |  60  |  69  |  73  |
| Professional       | 54 – 66 °                 |  47  |  54  |  60  |  66  |  70  |
| Broad (All Levels) | 51 – 64 °                 |  44  |  51  |  57  |  64  |  71  |

## Use Cases

* Hip loading analysis
* Stride mechanics assessment