CMVJ height	The maximal vertical displacement achieved during the countermovement jump	in
Jump maximum change in acceleration	The greatest instantaneous change in vertical acceleration recorded across the jump	m/s3
Eccentric impulse	The total impulse generated during the eccentric (downward) phase of the jump, normalized to body mass	Ns/kg
Concentric impulse	The total impulse generated during the concentric (upward) phase, normalized to body mass	Ns/kg; “Drive”
Maximum velocity	The peak vertical velocity attained during the concentric phase	m/s
Average maximum force	The mean of the maximal vertical ground reaction forces recorded across the jump	N
Maximum power	The highest instantaneous power output generated during the concentric phase, normalized to body mass	W/kg
Unweighting time	The duration between movement initiation and the minimum force point that precedes downward acceleration	s
Eccentric time	The total duration of the eccentric phase	s
Concentric time	The total duration of the concentric phase	s
Time to take-off	The elapsed time from movement onset to departure from the force plate	s
Time to maximum acceleration	The time from movement initiation to the peak vertical acceleration	s
Countermovement depth	The maximum downward displacement of the center of mass during the eccentric phase	m
Average braking rate of force development	The mean rate at which force increases during the eccentric braking phase	N/s; “Load”
Average relative concentric force	The average concentric force output normalized to body mass	N/kg; “Explode”
COPx unweighting displacement	Mediolateral center-of-pressure displacement during the unweighting phase	m
COPy unweighting displacement	Anteroposterior center-of-pressure displacement during the unweighting phase	m
COPx eccentric displacement	Mediolateral center-of-pressure displacement during the eccentric phase	m
COPy eccentric displacement	Anteroposterior center-of-pressure displacement during the eccentric phase	m
COPx sway velocity	The mean mediolateral sway velocity across the jump phases	m/s
COPy sway velocity	The mean anteroposterior sway velocity across the jump phases	m/s
Average landing rate of deceleration	The mean rate at which vertical velocity decreases during landing	m/s3
Relative force at zero velocity	The concentric force output at the instant center-of-mass velocity passes through zero	N/kg
Modified Reactive Strength Index (mRSI)	A measure of explosive reactive ability calculated as jump height divided by ground-contact time
Reactive Strength Index (RSI)	A measure of plyometric performance calculated as flight time divided by ground-contact time
Sparta Score	A composite score integrating Load, Explode, and Drive variables derived from Sparta’s proprietary force-plate algorithm