> ## 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.

# Hips Feet Stationary

> Binary indicator of whether the hips and feet refrain from rotating inwards or outwards during the squat.

## Technical Details

* **Variable Type:** Discrete Metric
* **Data Type:** Boolean (binary)
* **Units:** 1 = yes, 0 = no
* **Column Name:** `hips_feet_stationary`
* **Aggregation:** rate
* **Precision:** 0
* **Optimal Direction:** Higher is better
* **Measurement:** Assessment of whether hips and feet rotation stays relatively neutral during the squat
  * Outward threshold: 10 degrees
  * Inward threshold: 5 degrees

## Description

Hips feet stationary is a binary indicator that the athlete's hips and feet don't rotate during the squat.
It reflects stability and proper mechanics, avoiding excessive strain on the knee joint.

## Use Cases

* Balance and stability assessment
* Test validity (e.g., discounting trials with steps or excessive movement)
* Screening for control