The impetus for this study stemmed from the frequent and misleading practice in sport science to use the Reactive Strength Index (RSI) and its modified version (RSI-mod) interchangeably when assessing reactive strength and agility across athlete populations. While both terms share similar nomenclature, RSI is calculated from depth jump (DJ) performance, featuring high-impact and short ground contact times, whereas RSI-mod is derived from countermovement jump (CMJ), which invo

The authors wrote "Effectiveness of a Generic vs. Specific Program Training to Prevent the Short-Term Detraining on Repeated-Sprint Ability of Youth Soccer Players" to address a common challenge in team sports: maintaining or improving repeated-sprint ability (RSA) in youth soccer players during periods of short-term detraining, such as a midseason break. Despite the known importance of RSA for soccer performance, especially amid regular disruptions to training schedules, lit

Introduction The article, authored by Stuart N. Guppy, PhD (Edith Cowan University), Kristina L. Kendall, PhD (Edith Cowan University), and G. Gregory Haff, PhD (Edith Cowan University; University of Salford), critically examines velocity-based training (VBT) methods in strength and conditioning. VBT, a strategy rising in popularity among performance coaches, employs objective measures of movement velocity to regulate training intensity, volume, and fatigue in resistance trai