> ## 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.

# Elbow Flexion at Launch

> Amount of rear elbow flexion at launch event. This measures the elbow angle at the start of the power generation phase.

## Technical Details

* **Variable Type:** Discrete Metric
* **Data Type:** Float
* **Units:** °
* **Column Name:** `rear_elbow_flexion_at_launch`
* **Aggregation:** mean
* **Precision:** 0
* **Measurement:** Rear elbow flexion angle
* **Timing:** At launch event
* **Typical Range:** 115 – 128 °
* **Optimal Direction:** Middle — moderate values are optimal

## Description

Elbow flexion at launch measures the amount of rear elbow flexion at the launch event, indicating the arm position and loading when starting the power generation phase.

## 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              | 110 – 124 °               |  99  |  110 |  118 |  124 |  128 |
| High School        | 114 – 126 °               |  100 |  114 |  122 |  126 |  131 |
| College            | 120 – 132 °               |  114 |  120 |  126 |  132 |  135 |
| Professional       | 120 – 132 °               |  113 |  120 |  125 |  132 |  135 |
| Broad (All Levels) | 115 – 128 °               |  103 |  115 |  122 |  128 |  134 |

## Use Cases

* Arm position analysis
* Rear elbow mechanics assessment
* Technique optimization