Table 4.

Input features for training the machine learning models.

Feature	Description
kb_score	Knowledge-based exercise score as proposed previously [27]
head_movement_speed	Number of head rotations per second (mean and standard deviation) in the yaw and pitch planes
head_movement_range	Range of head rotations (mean and standard deviation) in the yaw and pitch planes
posture	Angle of the torso (sitting and standing)
trunk_sway	Mean and standard deviation of trunk sway
gait_parameters	Center of pressure on both feet (mean distance covered by the center of pressure and standard deviation per gait cycle); double support time (mean value and standard deviation per gait cycle); single support time (mean value and standard deviation per gait cycle); step duration (mean value and standard deviation per gait cycle); stride duration (mean value and standard deviation per gait cycle); cadence (mean value and standard deviation per gait cycle)