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What a countermovement jump measures, how this app measures it, and what the published numbers say. Every claim here carries its source.

• What Is a Countermovement Jump, and Why Do Coaches Measure It?

  The countermovement jump is the most widely used field test of lower-body neuromuscular function. What it measures, how widely it is used, and what the evidence says it goes with.

• How Honest Jump Measures a Jump

  A measurement takes about fifteen seconds and needs nothing but a phone and somewhere to stand. What happens during it, how to hold the phone, and where each number in the report comes from.

• What the Numbers Mean

  Jump height, take-off velocity, peak force and mRSI: where each number in a Honest Jump report comes from and what it tells a coach.