Jump testing
Jump testing tracks explosive output over time. Import your jump-mat exports and Underdog builds leaderboards and trends for counter-movement jumps, drop jumps and reactive-strength tests.
Who can use it: everyone can view the leaderboards; admins and coaches upload tests. Jump testing is a per-org feature — if it's switched off in Settings, the page is hidden.
Importing tests
From the Jump testing page, choose Upload Chronojump CSV and select your
export (.csv or .xlsx). Underdog reads the test date, jump type and box
height, matches each row to an athlete, and shows you a preview before you commit.
Submit, and the session joins the leaderboard.
Reading the leaderboard
Pick a jump type and a test date to rank the squad for that session:
- Best (cm) — the athlete's best attempt that session.
- Avg (cm) — the mean across their valid attempts.
- Trend — the percentage change from their previous session of the same type, so you can see who's improving and who's sliding.
- Attempts — how many they recorded.
For reactive-strength tests, two extra columns appear:
- Best RSI — the Reactive Strength Index (jump height relative to ground contact time): a measure of how springy the athlete is.
- Avg CT — average ground contact time in milliseconds; lower is quicker off the floor.
Why it matters
CMJ height and RSI are sensitive markers of neuromuscular fatigue and readiness. A meaningful drop against an athlete's own baseline is worth a second look — which is exactly what the CMJ decline and RSI drop flags in Concerns surface automatically.
Related
- Concerns — automatic flags when jump output declines.
- Metrics reference — definitions for the derived metrics.