> ## 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.

# Average Arm Circle Radius

> Average shoulder-to-wrist distance during the arm circle, normalized by arm length.

## Technical Details

* **Variable Type:** Discrete Metric
* **Data Type:** Float
* **Units:** ratio
* **Column Name:** `average_arm_circle_radius`
* **Aggregation:** mean
* **Precision:** 2
* **Calculation:** Average shoulder-to-wrist distance divided by (upper arm length + forearm length)
* **Timing:** Between drive start and release events
* **Optimal Direction:** Higher is better

## Description

Average arm circle radius measures how extended the throwing arm stays during the windmill arm circle, calculated as the average shoulder-to-wrist distance (normalized by arm segment length) between drive start and release. Values closer to 1 indicate a fully extended arm circle.

## Use Cases

* Arm circle consistency assessment
* Mechanics evaluation