Rooney Baseball

⚡ The #1 reason pitchers lose 5+ MPH and shred their elbows? They don't know how to HINGE. 📉

If you push off the rubber with your quad instead of loading your glute, your hips open early. Your hip/shoulder separation dies. Your arm gets dragged behind your body.
To get elite hip/shoulder separation, you must master the rear hip hinge.

🧬 The Biomechanics of the Hinge

The Load: Sit back into your rear glute and hip socket during the stride, keeping your back knee stable over your foot.
The Delay: Hinging holds your pelvis closed longer, forcing it to stay sideways while your momentum moves down the mound.
The Snap: When your front foot plants, your pelvis snaps open violently while your shoulders stay closed.
The Result: Massive elastic tension across your torso that whips your arm forward with effortless velocity.

🛑 Check for This Flaw
Watch your video from the side. If your back knee immediately drifts forward toward the plate during your lift, your quad is dominating, your hinge is gone, and your hips are opening early.

DVS Baseball The Kinetic Arm Elite Functional Performance Players Athletic Club Dave Dagostino Jim Rooney

🚀 Rooney Baseball has a brand new online home! 🚀

We are thrilled to announce the official launch of our updated website: 👉 https://rooneybaseball.com
Whether you are an aspiring player, parent, or coach, our new site makes it easier than ever to unlock MLB-level training, biomechanical insights, and expert development tools.

⚾ Ready to Train?
All training session scheduling and booking is officially live! Your development journey starts with your first critical step:

* Initial Evaluation & Assessment: Every training program begins with a complete skill and movement evaluation to analyze mechanics, maximize power, and protect long-term arm care.

🎙️ Listen & Learn

"Toe the Rubber: Player Development for All Ages" Podcast: Tune in to hear real conversations, expert coaching insights, and stories from baseball professionals who have lived the game at every level.

📚 Protect Your Arm

"Young Arm at Risk" Book: Grab your copy directly through the new site to explore crucial insights into movement-based training, efficient mechanics, and durability.

Led by former MLB pitcher, coach, national scouting supervisor, and Milwaukee Brewers pitching coordinator Jim Rooney, our mission is to build stronger, smarter, and healthier ballplayers.

🔗 Head over to https://rooneybaseball.com to book your initial assessment today!

The Kinetic Arm DVS Baseball Elite Functional Performance Players Athletic Club Dave Dagostino Jim Rooney

Jim Rooney LLC | Baseball Instructor in Charlotte Metro Area Jim Rooney offers MLB-level instruction and podcast insights to help players maximize their potential on and off the field.

The research is out there. Many times over the same message is being stated. The question becomes who is listening.

The 10,000-hour rule says: the more hours of structured practice, the higher your ceiling.

A major 2016 study found deliberate practice explains just 18% of overall sports performance. At the elite level, that number drops to around 1%.

So what actually predicts elite performance?

Competition experience. Psychological resilience. Unstructured play, the “backyard effect.” Physiological traits. The environment a player grows up in.

Hours in the gym are just one small piece.

Breaking skills into isolated reps creates an illusion of competence.

It looks clean in practice. But the player never learns to solve live problems, so it breaks down the moment a real game applies pressure.

Skill isn’t muscle memory. It’s the relationship between a player and their environment.

Chasing hours early has fuelled another problem: early specialization.

The same research found the difference in starting age between elite and average athletes was just 0.11 years. Essentially nothing.

Early specialization is linked to higher rates of burnout and injury.

The alternative is sampling, playing multiple sports as a kid.

It builds broader motor skills, helps players find different ways to solve the same problem, and builds a deeper love for the game.

A player isn’t a machine. You can’t input 10,000 hours of repetition and expect a world-class output.

Expertise isn’t a ticking clock you can beat. It’s a long, non-linear journey of adaptation.

Comment “SENDCLA” and I’ll send you our FREE Skill Acquisition Workshop.

Every single day another “expert” appears. And I’ll tell you why. AI can generate content, social media can manufacture attention, and anyone can rent credibility for at least a little while. It feels like everyone suddenly knows everything, especially if you don’t know ‘x’ about ‘y’. But one mustn’t forget, appearances and capability have always been far different currencies. While a quick slamming of letters on a keyboard into can get you commoditized information, context and deeply understanding is still incredibly rare. Visibility has become cheap, while trust will forever remain expensive. It’s easy to know what to say (chat will tell you), but that isn’t the same thing as knowing why it’s true or when it applies. We see it all the time in the S&C/Fitness space. You can know all day long exists, but do you know who to use it on and why it does or doesn’t make sense? And look where that’s got us.. We have a whole band of jack-offs marketing “train like the pros” to parents of kids who are quite literally the furthest they could be from pros. (And some of these parents still buy the nonsense lol, Lord help us.) But there is a (really good) reason these guys who push and preach this bu****it they can’t back never ever stand the test of time. It’s because as a coach, eventually, you get found out. You must sustainably produce. Reality grades everyone eventually. Fire emoji comments on your posts showcasing s**tty drills that don’t transfer if your athletes don’t improve. Your content strategy doesn’t matter if your business isn’t generating real money. And you can bump your gums all day long with the talk, but if you can’t walk it, you’re worthless. Even in 2026, the people who continue to separate themselves can be found doing the same unsexy things that have always worked best: Studying deeply. Practicing relentlessly. And consistently refining themselves over the years. The internet will always reward appearance first. But those who do the real work required to be great always win in the end. They always have. And t

Private equity is buying youth sports and most parents have no idea what that means for their kid. This is not about development anymore. This is about profit. Save this and share it.

One of the hidden benefits of strength training? ⤵️⁠ ⁠ It gives you a movement language to fall back on when things go sideways.⁠ ⁠ When someone has spent time squatting, hinging, lunging, pressing, balancing, and understanding basic positions under load, rehab becomes a lot more straightforward because we already have shared reference points.⁠ ⁠ We can regress the movement, slow it down, reduce the load. We can add support and build it back progressively.⁠ ⁠ The person already knows what the shape feels like.⁠ ⁠ What gets trickier is when someone gets injured and they're trying to learn movement for the very first time while also dealing with pain, swelling, fear, and tissue healing.⁠ ⁠ That’s a much harder conversation.⁠ ⁠ This is one of the reasons I think everyone benefits from some foundational strength and conditioning practice, regardless of age or sport.⁠ ⁠ You don’t need to become a competitive lifter, but you do want enough movement literacy that your body has options and your brain has context when life inevitably throws you a curveball.⁠ ⁠ 🗣️ It’s a lot easier to navigate the system when you already speak a little of the language.⁠ ⁠ Follow me @TheReadyState for more of my philosophy on training and recovery.

The Young Arm at Risk

A Deep Analysis of the Author’s Core Ideas, Mental Models, Frameworks, and Practical Applications

Author: Jim Rooney

⸻

Executive Summary

The Young Arm at Risk argues that the current youth baseball environment has created an epidemic of preventable arm injuries—not because athletes are weaker than previous generations, but because the system itself rewards short-term performance over long-term development.

The book’s central thesis is:

Most arm injuries are not random events—they are the predictable outcome of poor movement development, excessive workload, and a culture obsessed with velocity rather than athleticism.

The book reframes injury prevention as a player-development issue rather than a medical issue.

Instead of asking:

“How do we fix injured pitchers?”

the book asks:

“How do we develop athletes who never become injured in the first place?”

⸻

Core Idea #1

Build the Athlete Before Building the Pitcher

Why it Matters

Pitching is an expression of athletic movement—not merely arm action.

Many young pitchers attempt to perfect pitching mechanics before developing:

* balance
* mobility
* coordination
* strength
* body awareness
* rotational power

Without these foundational qualities, the arm compensates for deficiencies elsewhere in the body.

⸻

Mental Model

Athleticism is the operating system.

Pitching mechanics are merely the software.

If the operating system is flawed…

No software update can fix it.

⸻

Real-Life Application

A 12-year-old should spend significantly more time developing:

* sprinting
* jumping
* balance
* crawling
* medicine ball throws
* strength training
* mobility

than throwing bullpen sessions.

⸻

Core Idea #2

Velocity Is an Outcome, Not a Goal

One of the strongest arguments throughout the book.

The author argues that baseball has reversed cause and effect.

Most programs chase:

Velocity

instead of developing the qualities that naturally produce velocity.

Velocity emerges from:

* force production
* sequencing
* timing
* efficiency
* movement quality

Trying to “throw harder” before these qualities exist often increases injury risk.

⸻

Mental Model

Don’t chase the speedometer.

Build the engine.

⸻

Real-Life Application

Instead of asking:

“How do I gain 5 mph?”

Ask:

“What physical qualities are preventing efficient force production?”

⸻

Core Idea #3

The Body Functions as One System

The arm does not throw the baseball.

The body throws the baseball.

The kinetic chain is the central scientific principle underlying the book.

Force travels:

Ground

↓

Feet

↓

Legs

↓

Hips

↓

Core

↓

Thorax

↓

Scapula

↓

Shoulder

↓

Arm

↓

Hand

↓

Ball

When one link fails…

Another link compensates.

⸻

Mental Model

Think of cracking a whip.

The handle generates energy.

The tip simply delivers it.

The arm is the tip—not the handle.

⸻

Application

Instead of fixing:

Arm slot

Work on:

* hip mobility
* trunk rotation
* balance
* lead-leg stability
* thoracic mobility

⸻

Core Idea #4

Pain Is a Warning, Not a Normal Part of Development

The author challenges one of baseball’s most dangerous cultural myths:

“Everyone’s arm hurts.”

No.

Healthy pitchers should not routinely experience:

* elbow pain
* shoulder pain
* biceps pain
* forearm tightness

Pain is information.

Ignoring pain often transforms a manageable problem into structural damage.

⸻

Mental Model

Smoke before fire.

Pain is the smoke alarm.

Don’t disable the alarm.

Find the fire.

⸻

Application

Parents and coaches should immediately investigate recurring pain instead of normalizing it.

⸻

Core Idea #5

Overuse Is Only Part of the Problem

Pitch counts matter.

Rest matters.

Recovery matters.

But the book argues something deeper.

Two pitchers can throw:

80 pitches.

One remains healthy.

The other develops elbow pain.

Why?

Movement efficiency.

The athlete with better sequencing experiences lower stress despite similar workloads.

⸻

Mental Model

Stress =

Workload × Efficiency

Less efficient movement multiplies stress.

⸻

Application

Workload management must include:

* mechanics
* movement screening
* fatigue monitoring
* recovery

⸻

Core Idea #6

Parents Must Become Informed Consumers

The book repeatedly emphasizes:

Parents outsource too much responsibility.

Many assume:

Travel ball coaches

Private instructors

Showcase organizations

know what is best.

The author argues:

Parents must understand development principles themselves.

⸻

Why?

Parents make decisions about:

* specialization
* showcases
* pitching volume
* private lessons
* showcases vs development

Poor information leads to poor choices.

⸻

Mental Model

Parents are CEOs.

Coaches are consultants.

The CEO retains final responsibility.

⸻

Core Idea #7

Athletic Diversity Protects Arms

One recurring theme:

Young athletes should move in many different ways.

Not simply pitch year-round.

Benefits include:

* coordination
* resilience
* proprioception
* reduced repetitive stress
* psychological freshness

⸻

Application

Basketball

Swimming

Soccer

Tennis

Track

All improve athletic development.

⸻

Core Idea #8

Early Success Often Predicts Later Problems

One of the book’s more counterintuitive arguments.

Youth baseball rewards:

Large

Early maturing

Hard throwing

players.

Those same players often stop developing because they rely on physical advantages instead of improving athletic qualities.

Late developers frequently surpass them.

⸻

Mental Model

Early winners aren’t always long-term winners.

⸻

Application

Evaluate potential rather than present dominance.

⸻

Core Idea #9

Long-Term Development Beats Short-Term Results

The author consistently contrasts:

Development

versus

Performance.

Winning today’s tournament often sacrifices tomorrow’s athlete.

⸻

Long-Term Questions

Will this athlete:

Be healthier?

Throw harder?

Enjoy baseball longer?

Still be pitching at age 18?

These questions matter more than winning a 12U championship.

⸻

Core Idea #10

Coaching Should Develop Problem Solvers

One of the strongest educational themes.

The best coaches do not create robots.

They create adaptable athletes.

Rather than prescribing every movement,

they teach:

* awareness
* self-correction
* experimentation
* feedback interpretation

⸻

Mental Model

Coach less.

Teach more.

⸻

Application

Instead of saying:

“Keep your elbow here.”

Ask:

“What did you feel on that pitch?”

This develops ownership.

⸻

Major Frameworks Presented

Framework 1

The Development Pyramid

Level 4

Pitching Skill

↑

Level 3

Power

Speed

Rotational Force

↑

Level 2

Strength

Balance

Coordination

↑

Level 1

Mobility

Movement Competency

Stability

Every level depends on the one beneath it.

⸻

Framework 2

The Injury Triangle

Injury Risk =

Movement Quality

Workload

Recovery

Poor performance in any one increases risk.

⸻

Framework 3

Development Timeline

Athlete

↓

Mover

↓

Thrower

↓

Pitcher

↓

Competitor

↓

High Performer

Most youth baseball reverses this order.

⸻

Framework 4

Decision Filter

Before any training decision ask:

Does this improve:

Movement?

Athleticism?

Health?

Longevity?

If not…

Don’t do it.

⸻

Key Mental Models

Throughout the book, several recurring mental models help explain the author’s philosophy:

* Build the engine, not the speedometer — Develop physical qualities rather than chasing radar-gun numbers.
* The arm is the messenger, not the culprit — Arm pain often reflects problems elsewhere in the kinetic chain.
* Movement before mechanics — Quality movement creates better mechanics, not the reverse.
* Think in decades, not seasons — Evaluate decisions by their long-term impact on health and development.
* Development compounds — Small improvements in movement quality, strength, and coordination accumulate into large gains over years.

⸻

Actionable Insights

The book translates its philosophy into practical recommendations:

1. Develop athletic movement before emphasizing pitching mechanics.
2. Prioritize quality movement over throwing volume.
3. Treat pain as feedback requiring investigation, not as something to “throw through.”
4. Build strength, mobility, and coordination year-round.
5. Follow structured throwing progressions and respect recovery.
6. Encourage participation in multiple sports or varied physical activities during development.
7. Evaluate coaches by their ability to develop healthy athletes, not simply by producing hard throwers.
8. Measure progress through improved movement efficiency, consistency, and durability—not only velocity.
9. Teach athletes to understand and self-regulate their own mechanics.
10. Make every development decision with the athlete’s long-term health and enjoyment of the game in mind.

⸻

The Central Takeaway

The unifying message of The Young Arm at Risk is that healthy, durable, high-performing pitchers are developed—not discovered. Velocity, command, and resilience are not isolated skills; they emerge from years of building athleticism, movement quality, sound decision-making, and efficient force transfer.

The book challenges coaches, parents, and organizations to redefine success. Rather than celebrating early radar-gun readings or youth tournament wins, it argues that the true measure of a development system is whether it produces athletes who continue to improve, stay healthy, and still love the game years later. That shift—from chasing immediate outcomes to investing in long-term capability—is the thread that connects every major argument in the book.

Dave Dagostino The Kinetic Arm DVS Baseball Jason Kimball Players Athletic Club Elite Functional Performance

Young Arm at Risk: The untold truth about the broken system contributing to youth pitching injuries in baseball Young Arm at Risk: The untold truth about the broken system contributing to youth pitching injuries in baseball

college coaches stop abusing young pitchers’ arms challenge, College World Series edition #baseball #collegebaseball #mlb

Do I love elements of social media? Sure do. Has social media enhanced my family’s life? I’m grateful to say it has. But I’m also, probably more than most, a bit more understanding of the dangers of social media when it comes to “what you see” vs. “what life is really like”. While I obviously try to use social media as an effective tool to enhance what our company is working to accomplish, globally, I can proudly say I’ve never outsourced a single piece of content. Of 9,000+ pieces, I’ve never made one post because I was paid to, nor have I ever once “aimed at going viral”. I literally post, freely, what’s on my mind, how we train our athletes, how I train myself, and how I train my own kids. And to be frank, it’s super easy to be consistent because I’m never having to “think of what to post” because I’m literally just posting the s**t we’re already authentically doing. And how I “got to this point” with our business and family dynamic stems not from social media. But what I spent tens of thousands of hours working on in the dark. The hands and knees dog work, where I was getting the s**t kicked out of me, day after day that nobody saw, much less gave a s**t about. And I’m grateful that I couldn’t pay my way around it. That I couldn’t optimize a post to earn a few bucks. And it’s because shoveling s**t when nobody is watching can’t be made into a highlight reel. But it does compound. And that’s my concern with social media sports. You know what they are. These bigger adult money driven organizations “influencing” kids behaviors for their gain. They’re pushing the bigger batflips. The goofy ass uniforms. The outlandish antics. They want it all on film. And they make the kids feel good about it by tagging them in a post to get their rush, while they as adults collect the dollars in the attention is currency era. But guess who loses when they find out the circus acts they performed for praise yield them jack s**t in the real world? The kids.