> ## 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.

# Foot Contact

> When the lead foot contacts the ground and begins accepting weight.

## Technical Details

* **Variable Type:** Event
* **Data Type:** Integer
* **Units:** Frame number
* **Column Name:** `foot_contact_frame`
* **Required for QA:** True
* **Measurement:** Front foot ground contact

## Description

Foot contact marks the moment when the front foot makes contact with the ground and begins accepting weight.
Identified using a combination of position and velocity of the ankle and toe keypoints.

This is a critical time point for sequencing the pitch as well as body position metrics

## Use Cases

* Stride time analysis
* Pitch sequence and order
* Posture and body position