> ## 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 Hip Flexion

> Maximum hip flexion angle at a given phase or event.

## Technical Details

* **Variable Type:** Discrete Metric
* **Data Type:** Float
* **Units:** degrees
* **Column Name:** Varies by phase and side; see Events/Phases
* **Aggregation:** mean
* **Precision:** 0
* **Optimal Direction:** Higher is better
* **Measurement:** Maximum hip flexion angle during the specified phase

## Events / Phases

* **At Takeoff:** Maximum hip flexion during the jumping phase ([Initiation](/biomechanics/activities/jump/events/initiation) to [Takeoff](/biomechanics/activities/jump/events/takeoff)).
  * Column examples: `jumping_left_hip_peak_flexion_angle`, `jumping_right_hip_peak_flexion_angle` (bilateral); `jumping_hip_peak_flexion_angle` (single-leg).
* **At Landing:** Maximum hip flexion during the landing absorption phase ([Landing](/biomechanics/activities/jump/events/landing) to [Landing Bottom](/biomechanics/activities/jump/events/landing-bottom)).
  * Column examples: `landing_left_hip_peak_flexion_angle`, `landing_right_hip_peak_flexion_angle` (bilateral); `landing_hip_peak_flexion_angle` (single-leg).

## Description

Peak hip flexion refers to the maximum hip flexion angle during takeoff or landing.
It reflects loading depth, technique, and absorption at the hip.
The side and phase determines which column name applies.

## Use Cases

* Hip contribution to jump and landing
* Technique and range of motion
* Bilateral or single-leg comparison