> ## 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.

# Peak Upper Arm Forward Angular Velocity

> Peak forward angular velocity of the upper arm segment in the serve direction.

## Technical Details

* **Variable Type:** Discrete Metric
* **Data Type:** Float
* **Units:** degrees/second (°/s)
* **Column Name:** `peak_upper_arm_forward_angular_velocity`
* **Measurement:** Peak forward (somersault) angular velocity of the upper arm segment

## Description

Peak upper arm forward angular velocity is the rotation speed of the upper arm in the serve direction (somersaulting forward).
It is the second segment in the optimal [Kinematic Sequence](/biomechanics/activities/tennis/metrics/forward-kinematic-sequence) (torso → upper arm → forearm).

## Use Cases

* Kinematic sequence and energy transfer
* Technique quality (optimal sequence)
* Comparison with peak torso and forearm velocities