> ## 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.

# Wrist Position vs. Pelvis at Release

> Wrist position relative to the pelvis at release, in the forward, up, and side directions.

## Technical Details

* **Variable Type:** Discrete Metric
* **Data Type:** Float
* **Units:** % of height
* **Aggregation:** mean
* **Precision:** 0
* **Timing:** At ball release event, using keypoints rotated to the pitch direction
* **Calculation:** Wrist position relative to the pelvis midpoint, normalized by athlete height

| Direction          | Reference                              | Column Name                        |
| ------------------ | -------------------------------------- | ---------------------------------- |
| Forward (fore/aft) | Positive = in front of the pelvis      | `wrist_forward_position_vs_pelvis` |
| Up (vertical)      | Positive = above the pelvis            | `wrist_up_position_vs_pelvis`      |
| Side (lateral)     | Positive = throwing side of the pelvis | `wrist_side_position_vs_pelvis`    |

## Description

These three metrics describe where the throwing wrist is positioned relative to the pelvis midpoint at the instant of ball release:

* **Forward** — how far in front of (or behind) the pelvis the wrist is, along the pitch direction. Optimal direction: higher is better.
* **Up** — how far above (or below) the pelvis the wrist is. Because softball pitches are released underhand, this value is typically negative. Optimal direction: middle — moderate values are optimal.
* **Side** — how far toward the throwing side (or glove side) of the pelvis the wrist is. Optimal direction: middle — moderate values are optimal.

Together, these three values describe the full 3D release point of the pitch relative to the athlete's base.

## Use Cases

* Release point assessment
* Mechanics analysis