> ## 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.

# Reactive Strength Index Modified (RSI Mod)

> Measures ratio of jump height to ground contact time or drop height.

## Technical Details

* **Variable Type:** Discrete Metric
* **Data Type:** Float
* **Units:** N/A (ratio)
* **Column Name:** `reactive_strength_index_modified`
* **Aggregation:** mean
* **Precision:** 2
* **Optimal Direction:** Higher is better
* **Measurement:** Jump height divided by appropriate time or drop metric (definition may vary by jump type)

## Description

Reactive Strength Index Modified is a measure of reactive strength and stretch-shortening cycle utilization.
The exact formula may vary by jump type but generally relates jump height to contact time (countermovement jump) or drop height (drop vertical jump).

## Use Cases

* Reactive strength assessment
* Plyometric capacity
* Drop jump and countermovement jump evaluation