> ## 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.

# Forward Kinematic Sequence

> Sequence of peak forward angular velocities (torso, upper arm, forearm). Optimal sequence is 'torso-upper_arm-forearm'.

<img src="https://mintcdn.com/upliftlabs/Ku7T6jLWrJyoK7uq/biomechanics/activities/tennis/images/kinematic-sequence.png?fit=max&auto=format&n=Ku7T6jLWrJyoK7uq&q=85&s=5dbf93bf9c992377429c1c87ddb66d46" alt="Forward kinematic sequence" width="500" height="500" data-path="biomechanics/activities/tennis/images/kinematic-sequence.png" />

## Technical Details

* **Variable Type:** Discrete Metric
* **Data Type:** Categorical / Array
* **Units:** N/A
* **Column Name:** `forward_kinematic_sequence`
* **Measurement:** Order in which segments reach peak forward angular velocity

## Description

Kinematic sequence describes the order in which the torso, upper arm, and forearm reach their peak forward angular velocities during the serve.
The optimal sequence is proximal-to-distal: torso → upper arm → forearm, supporting efficient energy transfer to the racket.

Derived from [Peak Torso](/biomechanics/activities/tennis/metrics/peak-torso-forward-angular-velocity), [Peak Upper Arm](/biomechanics/activities/tennis/metrics/peak-upper-arm-forward-angular-velocity), and [Peak Forearm](/biomechanics/activities/tennis/metrics/peak-forearm-forward-angular-velocity) forward angular velocities; time-series versions are in [Forward Angular Velocity Time Series](/biomechanics/activities/tennis/metrics/forward-angular-velocity-time-series).

## Use Cases

* Technique quality and sequencing
* Comparison with optimal sequence (torso-upper\_arm-forearm)
* Coaching and training feedback