> ## 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.

# Lead Shoulder Flexion at P1 Address

> Lead shoulder forward/backward raise angle relative to the trunk at P1 Address.

## Technical Details

* **Variable Type:** Discrete Metric
* **Data Type:** Float
* **Units:** deg
* **Column Name:** `lead_shoulder_flexion_at_p1`
* **Aggregation:** mean
* **Precision:** 0
* **Optimal Direction:** N/A
* **Measurement:** Lead shoulder flexion angle relative to the trunk, sampled at the P1 Address event

## Description

Lead Shoulder Flexion at P1 Address reports the forward/backward raise angle of the lead shoulder relative to the trunk, sampled at the P1 Address event. It is used to characterize upper-body posture and arm position at key points in the swing.

## Use Cases

* Upper body posture assessment
* P1 Address position analysis