Sample report · illustrative data
The Studio by Catalyst  ×  Hawks Baseball

Baseball Performance & Arm-Health Report

Jordan Sample · 14U · Pitcher / Infield · Throws R
Screen date: Sample
Age 14
5'7" · 132 lb
Platform: VALD DynaMo + ForceDecks
Risk Tier
YELLOW

The one-line read

Jordan is a strong, developing thrower with a powerful lower body. The screen surfaced a few early, correctable arm-care items — a posterior-cuff strength gap, a throwing-arm strength imbalance, and a landing imbalance. None are injuries; all are exactly what this screen is built to catch and train before they cost him time on the mound.

At a glance

0.67
Shoulder ER:IR Ratio (throwing)
Below 0.70 target
−8%
Shoulder ER Strength · throw vs non-throw
Build the cuff
8%
Grip: Throwing vs Non-throwing
Throwing arm lower
28.0 cm
Vertical Jump (power)
Strong for age
16%
Landing Force Asymmetry
Priority
Even
Lower-body Takeoff Symmetry
On target

Athlete profile

Position / throwsPitcher & infield · throws right · bats right
TeamHawks Baseball Academy · 14U
WorkloadYear-round play · ~2 throwing teams · no true offseason
HistoryOccasional medial elbow soreness after long outings (no diagnosis)
Recovery habitsMinimal structured arm-care or mobility currently
GoalsAdd velocity safely · stay healthy · make the high-school squad

What we found — the priorities

1
Posterior rotator-cuff strength
His external-rotation (ER) strength lags his internal rotation, giving a throwing-shoulder ER:IR ratio of 0.67 (we look for ~0.70+). The "brakes" of the throwing motion are underpowered — the #1 thing to build.
2
Throwing-arm strength symmetry
His shoulder external-rotation and grip strength are lower on the throwing arm than the glove side. Rebuilding the throwing-side cuff and forearm restores balance and helps protect the elbow.
3
Landing / lower-body symmetry
On the force plates he absorbs 16% more force on one leg landing. A balanced base protects the arm — uneven legs route more stress up the chain.
Page 1 of 4 — SAMPLE Baseball Performance & Arm-Health Report. Illustrative data for demonstration. A wellness & movement screen, not a medical diagnosis. VALD DynaMo + ForceDecks. © The Studio by Catalyst.

Arm Health & Strength — throwing vs non-throwing

Measured with a handheld VALD DynaMo dynamometer. In throwers, the internal rotators get strong from throwing while the external rotators (the posterior cuff that decelerates the arm) lag — so we watch the ER:IR ratio closely.

MeasureThrowing (R)Non-throw (L)Read
Grip strength36 kg39 kg−8% throwing
Shoulder external rotation (ER)8.8 kg9.6 kgBuild ER
Shoulder internal rotation (IR)13.1 kg12.4 kgStrong
ER : IR ratio0.670.77Below 0.70
Throwing-shoulder ER:IR ratio0.67 · target 0.70–0.75
The dashed line is the 0.70 target. A lower ratio means the posterior cuff can't fully "put on the brakes" after ball release — the most common, most trainable arm-injury risk factor in throwers.
What this means. Jordan's throwing arm is strong through the internal rotators (the "gas pedal" the throwing motion builds) but lags in external rotation and grip — the posterior cuff that decelerates the arm. Re-balancing the two is the highest-yield, most trainable way to protect a young thrower's elbow and shoulder.

Why this matters for his arm

The deceleration problem

Up to half of youth baseball injuries are overuse, and the elbow/shoulder take the brunt. A weak posterior cuff (low ER:IR) means the body decelerates the arm with the joint instead of the muscle — exactly the pattern that precedes elbow & shoulder breakdown.

The good news

Every item here is trainable and Jordan is ahead of the curve by catching it now. Posterior-cuff strength, throwing-arm balance and landing symmetry respond quickly — and the same work that protects the arm also lets him add velocity safely.

Page 2 of 4 — SAMPLE. ER:IR ratio & strength-symmetry reference ranges from published throwing-athlete literature; illustrative values. Not a medical diagnosis. © The Studio by Catalyst.

Body Map — what we flagged & why it matters

Every flag maps to a place on the body and a mechanism. Here's the anatomy of Jordan's plan — red = primary, gold = monitor — and the science behind each call.

1 2 3 Throwing arm = right
1 · Throwing shoulder & rotator cuff Primary
Flagged: ER:IR ratio 0.67 (below ~0.70). Why it's flagged & matters: the posterior cuff is what decelerates the arm after ball release; when it can't keep up, the elbow's UCL and the shoulder absorb that force instead — the mechanism behind most youth elbow/shoulder breakdowns. Target ER:IR ≥ 0.70.
2 · Throwing-arm strength symmetry Build
Flagged: external-rotation and grip strength lower on the throwing arm than the glove side. Why: throwing builds the "gas pedal" (internal rotation) far faster than the "brakes" (external rotation) and forearm — rebuilding that balance is the single most trainable arm-injury safeguard.
3 · Lower body & landing Monitor
Flagged: 16% landing-force asymmetry on the force plates. Why: the legs and hips are the engine — an uneven base leaks force up the kinetic chain to the arm. A balanced, symmetric lower body is the arm's best protection.
WHY WE FLAG THESE   The arm-health markers here — the ER:IR strength ratio, throwing-vs-glove-side strength balance, and kinetic-chain (force-plate) symmetry — are the factors most consistently tied to throwing-arm injury in the research (American Sports Medicine Institute / Andrews; MLB–USA Baseball Pitch Smart; published youth-throwing literature). Reference ranges are applied to a youth thrower; thresholds are flags to train toward, not pass/fail lines, and this is a movement screen — not a medical diagnosis.
Page 3 of 4 — SAMPLE. Body map & mechanisms · illustrative data. A wellness & movement screen, not a medical diagnosis. © The Studio by Catalyst.

Lower-Body Power & Symmetry — VALD ForceDecks

A strong, symmetric lower body is the engine of a safe, powerful delivery — it absorbs landing forces so the arm doesn't have to.

Vertical jump power28.0 cm · strong for age
Landing force — left vs right16% · one leg absorbs more
Target under 10% (dashed line). An uneven base sends extra stress up the chain toward the throwing arm — landing & single-leg work evens it out.
Take-off force — left vs rightEven · on target

Strength symmetry — throwing vs glove side (DynaMo)

MeasureThrowingGlove sideRead
Shoulder external rotation8.8 kg9.6 kg−8% · build
Grip strength36 kg39 kg−8% · build
ER : IR ratio (throwing arm)0.670.77Below 0.70

The throwing arm's "brakes" (external rotation) and grip lag the glove side — the pattern we re-balance to take stress off the elbow.

Risk tier & arm-care plan

🟡 MODERATE
Early, correctable deficits — the ideal time to act. Targeted strength training + recovery now keeps Jordan developing and on the field. We re-test on Fridays to track it.

His 4-week starting plan

  • Posterior cuff: banded ER, prone ER raises, rhythmic stabilization 3×/wk (raise ER:IR toward 0.70+).
  • Throwing-arm balance: external-rotation + grip/forearm work to even the throwing vs glove side.
  • Lower body: single-leg + landing/decel work to even the 16% landing gap.
  • Recovery: guided Friday recovery + an at-home arm-care routine.

Re-test: Friday monitoring every 2–3 weeks — ER:IR ratio, throwing-arm strength balance and landing symmetry — so we catch fatigue and progress objectively, while it's still reversible.

Page 4 of 4 — SAMPLE. Built for Baseball · The Studio by Catalyst × Hawks Baseball · catalystperformancesd.com. A wellness & movement screen, not a medical diagnosis.