> ## 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. # Stance Position > Classification of serve stance position: platform or pinpoint. Serve start position ## Technical Details * **Variable Type:** Discrete Metric * **Data Type:** Categorical * **Units:** N/A * **Column Name:** (implementation-specific) * **Measurement:** Serve stance type — 'platform' (feet remain relatively fixed) or 'pinpoint' (back foot steps forward to meet front foot) ## Description Stance position describes how the player positions the feet during the serve. In a platform stance, the feet stay in a fixed relationship; in a pinpoint stance, the back foot moves toward the front foot during the motion. This can affect timing, balance, and lower-body metrics. ## Use Cases * Technique classification * Comparing mechanics across stance types * Coaching and consistency assessment