Hongyi Chen's 3T Take-Off: Why RSI Matters for Figure Skaters

Take Hongyi Chen's triple toe loop and freeze it on the frame where the pick hits the ice. On a toe loop that contact lasts only a fraction of a second, yet it has to turn the entry speed into height. This is what the Reactive Strength Index measures: how much jump height an athlete gets for each fraction of a second spent on the ground. And on a triple, those few hundredths decide whether the jump is fully rotated or called q or <.

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