> ## 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.

# Twist Kinematic Sequence

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

## Technical Details

* **Variable Type:** Discrete Metric
* **Data Type:** Categorical / Array
* **Units:** N/A
* **Column Name:** `twist_kinematic_sequence`
* **Measurement:** Order in which segments reach peak twist (like a tornado) angular velocity

## Description

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

Related segment peaks:

* [Peak Pelvis Twist](/biomechanics/activities/tennis/metrics/peak-pelvis-twist-angular-velocity)
* [Peak Torso Twist](/biomechanics/activities/tennis/metrics/peak-torso-twist-angular-velocity)
* [Peak Upper Arm Twist](/biomechanics/activities/tennis/metrics/peak-upper-arm-twist-angular-velocity)

Speedup factors:

* [Twist Trunk Arm Speedup](/biomechanics/activities/tennis/metrics/twist-trunk-arm-speedup)
* [Twist Pelvis Trunk Speedup](/biomechanics/activities/tennis/metrics/twist-pelvis-torso-speedup)

## Use Cases

* Technique quality and twist sequencing
* Comparison with optimal sequence
* Coaching and training feedback