> ## 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. # Running > Biomechanical analysis of running gait, including stride patterns, ground contact phases, and joint kinematics. ## Overview Running gait analysis evaluates the biomechanics of running motion, including stride patterns, ground contact phases, and joint kinematics during the running cycle. Example image of a man doing a running, top view Example image of a man doing a running, front view Example image of a man doing a running, quarter view Example image of a man doing a running, side view ## Instructions Run at a consistent, natural pace on a flat surface or treadmill. Maintain normal running form without consciously altering your stride. Multiple consecutive strides will be captured and analyzed. ## Variables Output Variables for running gait analysis: ### Generic Outputs Every capture includes session metadata, standard joint angle/velocity time series, and 3D keypoint positions common to all movements. See [Generic Outputs](/biomechanics/activities/generic_outputs) for the full list. ### Events | Metric | Data Type | Description | | ----------------- | --------- | ------------------------------------------------------- | | Right Heel Strike | Int | when the right heel contacts the ground | | Right Toe Off | Int | when the right toe leaves the ground | | Left Heel Strike | Int | when the left heel contacts the ground | | Left Toe Off | Int | when the left toe leaves the ground | | Right Mid Stance | Int | the instant of maximum right knee flexion during stance | | Left Mid Stance | Int | the instant of maximum left knee flexion during stance | | Right Mid Swing | Int | the instant of maximum right knee flexion during swing | | Left Mid Swing | Int | the instant of maximum left knee flexion during swing | ### Phases and Stages of Gait | Phase | Stage | Start | End | Event or Phase | | ------------ | --------------- | ----------------- | ----------------- | -------------- | | Right Stance | Initial Contact | Right Heel Strike | Right Mid Stance | Phase | | Right Stance | Terminal Stance | Right Mid Stance | Right Toe Off | Phase | | Right Swing | Initial Swing | Right Toe Off | Right Mid Swing | Phase | | Right Swing | Terminal Swing | Right Mid Swing | Left Heel Strike | Phase | | Left Stance | Initial Contact | Left Heel Strike | Left Mid Stance | Phase | | Left Stance | Terminal Stance | Left Mid Stance | Left Toe Off | Phase | | Left Swing | Initial Swing | Left Toe Off | Left Mid Swing | Phase | | Left Swing | Terminal Swing | Left Mid Swing | Right Heel Strike | Phase | ### Discrete Metrics | Metric | Data Type | Units | Description | | ------------------------------ | --------- | --------- | --------------------------------------------------------- | | Step Length | Float | meters | Distance between heel strikes | | Step Width | Float | meters | Lateral distance between feet | | Stride Length | Float | meters | Distance between same foot heel strikes | | Cadence | Float | steps/min | Number of steps per minute | | Walking Speed | Float | m/s | Average walking speed | | Step Time | Float | seconds | Time between heel strikes | | Stride Time | Float | seconds | Time between same foot heel strikes | | Stance Time | Float | seconds | Time foot is in contact with ground | | Swing Time | Float | seconds | Time foot is not in contact with ground | | Double Support Time | Float | seconds | Time both feet are in contact with ground | | Single Support Time | Float | seconds | Time only one foot is in contact with ground | | Knee Flexion | Float | degrees | Maximum knee flexion during gait cycle | | Hip Flexion | Float | degrees | Maximum hip flexion during gait cycle | | Ankle Dorsiflexion | Float | degrees | Maximum ankle dorsiflexion during gait cycle | | Ground Reaction Force | Float | N | Maximum ground reaction force | | Joint Angles at Peak Force | Float | degrees | Joint angles at instant of peak ground reaction force | | Joint Velocities at Peak Force | Float | degrees/s | Joint velocities at instant of peak ground reaction force | | Symmetry Index | Float | % | Comparison of left and right side parameters | ## Notes * Kinematic data typically captured at 240Hz for Running Analysis