The why behind the numbers
A radar gun tells you the swing is slow. It can't tell you it's slow because the load pushes instead of pulls. The biomechanics screening is your athlete's swing or delivery on slow-motion film, broken down frame by frame and joint by joint — so the plan fixes the cause, not the symptom.
Film, slowed down until it can't hide anything
Every assessment already includes movement pattern screening and athletic testing. The biomechanics screening goes a level deeper on the skill itself: your athlete's swing or delivery captured on video, then broken down frame by frame against the checkpoints we coach — the same breakdown format our evaluation reports are built on.
Frame by frame
The movement is stopped at the moments that decide it — load, launch, contact or release, finish — instead of judged at full speed by eye.
Joint by joint
Hips, hinge, scap, front leg, arm slot: each checkpoint gets a verdict — a strength to protect, or a priority to fix.
Tied to the plan
Every finding lands in the written report as a named priority fix with the drills that address it — then the re-test is checked against the same frames. Won on film, not on feel.
The breakdown, checkpoint by checkpoint
Two examples of the format — one swing, one delivery — using the checkpoints we actually coach.
Hitting breakdown
Frame · Through contact
Your athlete's film here
Set the scap — bow & arrow loadHold the hinge through contactBarrel turns behind the ballBack hip firesIllustration of the breakdown format — the real thing is built from your athlete's own slow-motion film, checkpoint by checkpoint.
Pitching breakdown
Frame · Foot strike
Your athlete's film here
Elbow at shoulder lineHips open, shoulders loadedFront knee stays softFinish out frontIllustration of the breakdown format — the real thing is built from your athlete's own slow-motion film, checkpoint by checkpoint.
This isn't opinion — it's measured
The checkpoints we screen against come from published motion-capture research on thousands of swings, high school to MLB — the same body of work behind Connor's Driveline Education certification. Their lab produced the numbers; your athlete's screening applies the lens with slow-motion film and sensors at Center STL.
The kinematic sequence
Each segment peaks after the one before it — the pelvis starts the whip, the hands finish it. When the order breaks, bat speed leaks.
PelvisTorsoUpper armHand
Peak averages: Driveline Baseball hitting-biomechanics research (2,167 mocap swings)
Why the order matters
The whip only works in sequence
Pelvis, then torso, then arm, then hands — each segment builds on the speed of the one before it. And the research is clear about where bat speed correlates strongest: the further up the chain, the tighter the link.
- Pelvis rotationR = 0.14
- Torso rotationR = 0.30
- Arm speedR = 0.28
- Hand speedR = 0.47
Correlation with bat speed, per Driveline's published research. It's why we screen the whole chain — a slow swing is rarely a hands problem alone.
Where contact happens, measured off the body
Contact depth = the distance from the hitter's center of gravity to the bat's sweet spot at impact. Out front means more runway for the barrel — deeper means less.
≈ 5 in further out front
Pro hitters' average contact vs. high schoolers' (49.7 cm vs 38.0)
R = 0.4 with bat speed
Further out front correlates with a faster barrel — more runway
R = 0.76 with attack angle
The trade-off: contact point strongly shapes launch direction
Relationships: Driveline Baseball hitting-biomechanics research. Diagram is an M4P illustration of the concept.
The gap between levels is measurable
Pro hitters swing ~10 mph faster and hit ~12 mph harder than high schoolers — and their hands rotate ~1,880 deg/s vs ~1,780. That gap is the training target.
Peak bat speed (mph)
Exit velocity (mph)
Data: Driveline Baseball hitting-biomechanics research — lab averages across 2,167 motion-capture swings (506 HS, 1,331 college, 250 pro).
Findings, written like coaching
Biomechanics findings don't arrive as a data dump. Each one is a named priority in the written evaluation — what the film shows, why it matters, and the work that fixes it.
- Strengths marked to protect — what's working stays in the plan on purpose
- Up to three priority fixes, each anchored to a specific frame of film
- Each fix mapped into the free 4-week program, week by week
- The re-test graded against the same checkpoints, on new film
From the report — the format
Priority Fix 1
The Load: Bow & Arrow — Pull, Don't Push
What the frame shows, in plain language a parent and an athlete can both act on — and the drills for it, scheduled into the 4-week program.
Strength — protect this
The engine runs in the right order
What's already working gets named too — so a month of fixes doesn't break what didn't need fixing.
Most events measure. Almost nobody explains.
Showcases and camps hand your athlete a number — exit velo, pitch velo — and move to the next kid. Two athletes with the same 68 mph exit velo can have completely different problems. The number can't tell them apart. The film can.
Measurement alone says
“Exit velo: 68 mph.”
A grade. No cause, no plan — and no way to know if next month's 70 came from growth or from getting better.
The biomechanics screening says
“68 — and here's the frame that's costing you the next five.”
A cause, a priority, and four weeks of work aimed at exactly that frame — then a re-test against the same checkpoints to prove it moved.
Add it to any assessment
+$75
One add-on price, every tier. Totals with the screening included:
- Hitting or Pitching$50 → $125
- Hitting & Pitching$75 → $150
- Hitting & Infield/Outfield$75 → $150
- Hitting & Catching$90 → $165
The screening is already ticked on the booking form when you arrive from here.