The purpose of this article was to provide practitioners with an improved understanding of the reactive strength index (RSI), reactive strength index modified (RSImod), and the ratio of flight time to contraction time (FT:CT) as they pertain to athlete monitoring and sports performance. Effective athlete monitoring should inform and impact decision making, regarding the status of athletes at the individual level, in a time-sensitive manner specific to their current training phase. Athlete monitoring should be valid, reliable, and sensitive to typical error value that allows for real changes in status to be reflected in outcomes that accurately distinguish "signal from noise". Vertical jump monitoring is considered to be a key indicator and as such is included in many strength and conditioning programs. The reactive strength index (RSI), reactive strength index modified (RSImod), and the ratio of flight time to contraction time (FT:CT) are jump tests being increasingly used to monitor readiness through the use of either a contact mat or a force plate. The RSI is measured utilizing drop jumps (DJ) and is specific to fast stretch-shortening cycle (SSC) activity while RSImod and FT:CT are measured using a countermovement jump (CMJ) and are specific to slow SSC. Because of the complex nature of neuromuscular fatigue RSImod and FT:CT may provide information that typical CMJ tests of jump height and power cannot accurately reflect. Therefore RSI, RSImod, and FT:CT may provide additional insight into neuromuscular status, reflecting alterations in neuromuscular strategy, beyond jump height.
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