Jump height tells you how high an athlete went. Jump power tells you how much work it took to get there. The second number depends on something the video cannot see: how much the athlete weighs.
That sounds obvious. In a busy testing session, it is easy to get wrong.
Picture a coach running a squad jump test on one phone. Ten athletes, one after another. Before this update, SpeedTrackr used the coach's own body weight for jump power unless the coach retyped a new weight for every athlete. Most coaches will not retype a number ten times between jumps. So a light athlete could end up with power worked out from a heavier coach's weight, and a heavy athlete from a lighter one. The jump height was fine. The power number was not about that athlete at all.
Now body weight is saved per athlete. The first time you pick an athlete for a jump test, the app asks for their weight once. After that it is on their profile, and every jump they do uses it. Pick a different athlete and their weight comes with them. Nobody has to remember to retype anything.
Here is how the jump test itself works, so it is clear what the number comes from.
You film the jump or import a clip you already have. The app works out jump height from the video. Drop jumps and hops also give RSI, the reactive strength index. Normal 60 fps video works, and slow motion is the most precise option. The result comes after the video. It is not live analysis on the camera screen.
Body weight is the piece that turns that height into power for one specific person.
A few habits keep the power number honest.
Weigh athletes before a testing block, not from memory. A weight from last season can be several kilos off, and the power number moves with it.
Update the weight when it really changes. An athlete who has put on muscle over a training block should not be scored on their old weight.
Compare an athlete with themselves first. Power across a squad depends on size. The more useful question is whether this athlete is producing more power than they did last month.
Keep the test the same. Same jump type, same arm rules, same surface, same camera spot. A change in setup can look like a change in the athlete.
For coaches with a group, this sits inside Coach Mode, which is on the web app and on Android. The Squad tab lists every athlete, when they last tested, and how many results they have. Each athlete has one page with their records, progress and every result. A NEW BEST tag shows when they beat an earlier result of their own. Their first result is a baseline, not a best.
None of this needs a jump mat or extra hardware. It needs a phone, a consistent setup, and the right body weight next to the right name.
The Android app is on Google Play: https://play.google.com/store/apps/details?id=com.speedtrackr.reactionpro
On an iPhone or a laptop, use the web app: https://www.speedtrackr.com/auth/login
There is no native iPhone app. iPhone users use the web app.
If you run a jump test this week, check one thing before the first athlete steps up. Whose weight is the app using? Make sure it is theirs.
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