Reading your report¶
The report is the numbers view of your throw. Open it from your throw card — the Report link — or from the Report button inside the 3D viewer.
At the top of the page is the throw it belongs to and when it was generated, plus two controls: Feedback, for telling us something is wrong with the analysis, and Save as PDF, which gives you a file you can send to a coach.
The headline numbers¶
Across the top sit the summary tiles. Three of them carry most of the meaning:
| Tile | What it is |
|---|---|
| Release Speed | How fast the hammer was travelling at the instant it left your hands, in metres per second. This is the single number that most determines how far the throw goes. |
| Est Distance | How far that release would carry, estimated from the release speed, angle and height. It is a calculation, not a measurement of where the ball landed — see the note below. |
| Turns | How many full turns across the circle were detected. Check it against what you actually did. If it is wrong, everything broken down per turn is shifted, and it is worth correcting. |
Any tile that reads — means that number could not be computed for this throw. That is
usually a tracking problem, not a throwing problem.
Estimated distance is not a measured distance
The estimate comes from the physics of the release. It does not know about wind, and it does not know where the ball actually landed. If you measured the throw, use your measurement — the estimate is for comparing throws against each other, where it is a good deal more reliable than it is as an absolute number.
Per-turn metrics¶
The main table has one row per turn, in order, and a final row labelled Release for the delivery. Reading down a column shows how something developed across the throw; that progression is usually more interesting than any single value.
Mean ω — mean angular speed for that turn, in revolutions per second. The single best summary of how fast that turn was. In a well-built throw this rises turn by turn and peaks at release.
Mean ω DS/SS — the same speed, split in two: the average while both feet were down,
then the average while only one foot was down, e.g. 1.85 / 1.72. The delivery row has no
single-support phase, so it shows a dash on that side. Comparing the two halves shows how
much of your speed is being carried on one foot versus two.
DS Fraction — what percentage of the turn you spent with both feet on the ground. The
delivery is entirely double support and reads 100%. Across the earlier turns this is the
rhythm of the throw: more double support means more of the turn spent able to actively
drive the hammer, less means quicker, more airborne turns.
Sep peak SS/DS — the largest separation between your hips and your shoulders during that turn, in degrees, split by phase. Separation is the wind-up stored in your torso — the hips leading, the shoulders trailing. Bigger peaks mean more stretch to pull against.
Orbit Tilt — how tilted the hammer's circle was during that turn, in degrees. What matters is whether it stays consistent across turns; a tilt that wanders means the plane of the throw is moving around.
ω max/min — the fastest and slowest the hammer was moving inside that one turn. A wide spread means the hammer surged and stalled within the turn; a tight spread means steadier rotation.
Body position¶
A second table gives Back Lean and Separation as per-turn averages, each with the range it moved through in brackets. Back lean is how far you were leaning back against the hammer; separation is the hip-to-shoulder wind-up described above. Both are averages of a continuously changing quantity, so the range in brackets is as informative as the average.
What to do with all this¶
- Compare like with like. One throw's numbers in isolation are hard to judge. Two throws side by side are much easier — that is what the Compare page is for.
- Follow one column at a time. Read Mean ω down the table and ask whether it is building. Then DS Fraction. Then Sep peak.
- Trust the shape before the absolute value. Progressions and comparisons are more robust than any single reading.
- Check Turns first. If the turn count is wrong, the per-turn rows are describing the wrong parts of the throw.
Next: Using the 3D viewer