| Handedness | N/A | Handedness of the athlete [‘right’ or ‘left’] (as input) | handedness |
| Kinematic Sequence | N/A | Sequence of segment peak angular velocities (twist speed) during the swing. Correct sequencing is pelvis-trunk-arm. | kinematic_sequence_order |
| Peak Pelvis Angular Velocity | deg/s | Max angular velocity of the pelvis segment. | peak_pelvis_angular_velocity |
| Peak Trunk Angular Velocity | deg/s | Max angular velocity of the trunk segment. | peak_trunk_angular_velocity |
| Peak Arm Angular Velocity | deg/s | Max angular velocity of the lead upper arm segment. | peak_arm_angular_velocity |
| Trunk to Arm Speed Up | ratio | Ratio (multiplication factor) of speed increase from trunk to arm. | trunk_to_arm_velocity_speedup |
| Pelvis to Trunk Speed Up | ratio | Ratio (multiplication factor) of speed increase from pelvis to trunk. | pelvis_to_trunk_velocity_speedup |
| Leads With Wrist | boolean | Binary indicator if wrist leads the swing, if wrist initiation event occurs before pelvis initiation event. | leads_with_wrist |
| Sway | boolean | Binary indicator of excessive lateral movement, determined by difference in farthest forward and backward pelvis position (forward = towards the pitcher) around max knee raise event. Distance threshold for sway fault is 8 cm (~3 in). | sway |
| Sway Leg | boolean | Binary indicator of excessive lateral movement, determined by rear ankle and knee joint centers. Considered a leg sway fault if the rear knee passes behind the ankle (further from pitcher). | sway_leg |
| Knee Dominant | boolean | Binary indicator if swing is knee-dominant, determined by if the rear hip and ankle joint angles differ by more than 25 deg at launch and if the rear ankle is dorsiflexed less than 15 deg at launch. | knee_dominant_swing |
| Vertical Pelvis Hike | boolean | Binary indicator of excessive vertical pelvis movement, determined if the pelvis keypoint finishes the swing (to ball contact) higher than where it started (at launch event). | vertical_pelvis_hike |
| Lateral Pelvis Tilt | boolean | Binary indicator of excessive lateral pelvis tilt, determined by whether the pelvis tilts upwards more than 10 deg during the swing (initiation to ball contact). | excessive_lateral_pelvis_tilt |
| Drifting Forward | boolean | Binary indicator of excessive forward movement, determine by whether the pelvis drifts forward (towards the pitcher) more than 15 cm (~6 in) from launch to ball contact events. | drifting_forward |
| Drifting Forward Magnitude | m | Distance drifted forward during the swing - see Drifting Forward. | drifting_forward_magnitude |
| Time to Ball Contact | s | Duration between initiation and ball contact events. | time_to_ball_contact |
| Time to Launch | s | Duration beween initiation and pelvis velocity initiation (launch) events. | time_to_launch |
| Pelvis Acceleration Time | seconds | Time from pelvis initiation (start of rotation) to peak pelvis angular velocity. | “ |
| Pelvis Deceleration Time | seconds | Time from peak pelvis angular velocity to pelvis termination (end of rotation). | “ |
| Hip Hinge | deg | Max amount of rear hip flexion between max foot raise and foot contact events. | hip_hinge |
| Trunk Coil | deg | Max rotation angle that the trunk turns away from the pitcher - facing directly to the pitcher is 0 deg. | trunk_coil |
| Trunk Tilt at Launch | deg | Amount of side-to-side trunk tilt at launch event (pelvis velocity initiation). Positive values indicate tilting towards the pitcher and vice versa. | trunk_tilt_at_launch |
| Scap Load at Launch | deg | Amount of rear shoulder flexion (+) or extension (-) at launch event. Flexion/Extension translates to horizontal adduction (+) and abduction (-), respectively. | rear_scap_load_at_launch |
| Elbow Flexion at Launch | deg | Amount of rear elbow flexion at launch event. | rear_elbow_flexion_at_launch |
| Elbow Flexion at Ball Contact | deg | Amount of rear elbow flexion at ball contact event. | rear_elbow_flexion_at_ball_contact |
| Lead Knee Angle at Ball Contact | deg | Amount of lead knee flexion at ball contact. | lead_knee_angle_at_ball_contact |
| Stride Length | m | Distance between the lead ankle at foot contact and the rear ankle at max foot raise event. | stride_length |
| Rear Arm Connection | m | Average distance between the rear elbow and mid-torso (halfway between mid-shoulder and mid-hip joint centers) between launch and ball contact events. | rear_arm_connection |
| Shoulder Rotation Plane Flexion | deg | Amount of trunk flexion required to reach the average plane of rotation of the shoulder joint centers. | shoulder_rotation_plane_flexion |
| Shoulder Rotation Plane Tilt | deg | Amount of trunk tilt (+ = towards pitcher) to reach the average plane of rotation of the shoulder joint centers. | shoulder_rotation_plane_tilt |
| Relative Hand Position - Towards Pitcher | m | Distance along the axis towards the pitcher (+) between mid-shoulders and the average of the two wrists at the foot contact event. | relative_hand_position_towards_pitcher |
| Relative Hand Position - Up | m | Distance along the up axis (+) between mid-shoulders and the average of the two wrists at the foot contact event. | relative_hand_position_up |
| Relative Hand Position - Away from Body | m | Distance along the axis away from the body (+) between mid-shoulders and the average of the two wrists at the foot contact event. | relative_hand_position_away_from_body |
| Linear Stretch | m | Distance between the lead ankle and center of both wrists along the pitch direction at foot contact. | linear_stretch |
| Ball Contact Method | N/A | Ball contact event detection method: [both audio, single audio, swing through]. | ball_contact_method |
| Trunk Center of Mass Position X | m | Trunk center of mass X position - for use with keypoint positions. [time series metric] | trunk_center_of_mass_x |
| Trunk Center of Mass Position Y | m | Trunk center of mass Y position (up/down) - for use with keypoint positions. [time series metric] | trunk_center_of_mass_y |
| Trunk Center of Mass Position Z | m | Trunk center of mass Z position - for use with keypoint positions. [time series metric] | trunk_center_of_mass_z |
| Body Center of Mass Position X | m | Whole body center of mass X position - for use with keypoint positions. [time series metric] | whole_body_center_of_mass_x |
| Body Center of Mass Position Y | m | Whole body center of mass Y position (up/down) - for use with keypoint positions. [time series metric] | whole_body_center_of_mass_y |
| Body Center of Mass Position Z | m | Whole body center of mass Z position - for use with keypoint positions. [time series metric] | whole_body_center_of_mass_z |
| Trunk Global Flexion | deg | Amount of trunk sagittal plane flexion relative to the global coordinate system. [time series metric] | trunk_global_flexion |
| Trunk Global Tilt | deg | Amount of trunk frontal plane side-to-side tilt relative to the global coordinate system. [time series metric] | trunk_global_tilt |
| Trunk Global Rotation | deg | Amount of trunk transverse plane rotation relative to the global coordinate system. [time series metric] | trunk_global_rotation |
| Pelvis Global Tilt | deg | Amount of pelvis frontal plane side-to-side tilt relative to the global coordinate system. [time series metric] | pelvis_global_tilt |
| Pelvis Global Rotation | deg | Amount of pelvis transverse plane rotation relative to the global coordinate system. [time series metric] | pelvis_global_rotation |
