Real results · anonymized

They moved up on
the whole field.

Every number below is real testing data from a GPS athlete, read against age-band norms — so you're seeing where they moved relative to athletes the same age, who were growing too. Names anonymized; numbers untouched.

17→64th Avg percentile · growth-adjusted

+47pts Average percentile-point gain

15/15 Tested metrics improved

9–17u Age bands compared against

Explore the data

One metric at a time.
Every athlete, side by side.

Start After training

Jack S.

2.19→1.93s 8→76

Braden S.

1.80→1.62s 24→90

Jackson O.

2.07→1.83s 13→47

The full stories

Three athletes.
Two years of receipts.

Jack S. · Baseball 10→12U · 2 yrs

8th avg percentile · start

69th avg percentile · after

+61 percentile points
growth-adjusted

across 5 tested metrics · vs age-band norms

Arrived at the bottom of his age group — single-digit percentiles across the board. Two years later he tested in the 70s and 80s on speed and velocity — against athletes his own age, who had been growing the whole time too.

10-yd accel

2.19→1.93s 8→76

10-yd fly

1.63→1.34s 8→84

30-yd

5.48→4.69s 8→80

Top velo

12.6→15.3 mph 8→82

Vertical

14.3→16.3″ 7→22

Braden S. · Baseball 15→17U · 2 yrs

28th avg percentile · start

71st avg percentile · after

+43 percentile points
growth-adjusted

across 5 tested metrics · vs age-band norms

A high-schooler who didn’t just get bigger — he climbed the age-band percentile on every speed and power metric we re-tested, against peers growing alongside him.

10-yd accel

1.80→1.62s 24→90

10-yd fly

1.21→1.10s 30→67

30-yd

4.31→3.91s 28→76

Top velo

16.9→18.7 mph 31→71

Vertical

21.6→27.5″ 26→48

Jackson O. · Baseball 12→14U · 2 yrs

14th avg percentile · start

53rd avg percentile · after

+39 percentile points
growth-adjusted

across 5 tested metrics · vs age-band norms

Behind the curve at 12U on every test. By 14U he was above it — top velocity alone climbed from the 7th to the 61st percentile for his age.

10-yd accel

2.07→1.83s 13→47

10-yd fly

1.51→1.22s 7→60

30-yd

5.07→4.32s 16→59

Top velo

13.5→16.8 mph 7→61

Vertical

16.5→20.8″ 28→37

How to read this

A percentile compares an athlete to others their own age. So when a younger athlete climbs from the 8th to the 76th percentile, he didn't just get older — he moved up on the kids who got older too. That's what growth-adjusted means: compared against peers who are growing over the same window, not growth subtracted out. An athlete who starts low tends to climb for statistical reasons alone, which is why we always show the starting percentile beside the finishing one.

Real, anonymized athlete testing data · 2024–2026 · percentiles are age-banded and cohort-relative, read against a male baseball reference set · individual results vary.

Athlete results