[ About ]
[ Batspeed Research ]
[ Swing Mechanics ]
[ Truisms and Fallacies ]
[ Discussion Board ]
[ Video ]
[ Other Resources ]
[ Contact Us ]

Key Differences between
Linear and Rotational Hitting

Is Shoulder Rotation Good or Bad

Roll Your Wrist

Hitting Theories vs Science

Transfer Weight To Front Leg

Hitting the Outside Pitch

Swing Down At The Ball

Let Go Of Top Hand

Keep Back Elbow Down

Pulling Your Head Off Ball

Don't Swing For The Fence

Baseball Hitting | Is Shoulder Rotation Good or Bad?

It would be safe to say all baseball hitting coaches agree on the importance of increasing bat speed. Disagreements arise when discussing the role of shoulder rotation in generating that bat speed. Linear coaches have concluded that allowing the shoulders to rotate will result in casting, hitting around the ball and pulling off the outside pitch. They use a batting cue, "Keep your shoulder in-there" to remind the batter not to allow the shoulders to rotate.

At Batspeed.com, we have a more positive view of shoulder rotation. We agree the "keep your shoulder in there" cue has merit during the stride and pre-launch movements. However, we do not agree that the shoulders should not rotate during the swing. We would point out that the linkage to the bat (through the arms) is connected at the shoulders - not at the hips. Therefore, for the rotational energy of the hips to be transferred up and out to the bat, the shoulders must rotate. In order to generate maximum bat speed, shoulder rotation should start as the swing is being initiated.

Well, whose right and whose wrong? We have often reminded our hitters not to put faith in any batting cue, tip or drill (including ours) whose merit cannot be verified in the swing mechanics of the games best hitters. With that in mind, let us test the "Keep your shoulder in-there" cue by analyzing the swings of good hitters. Below are a couple videos that feature 4 good MLB hitters and several top softball hitters.

I am sadly convinced that the "Keep your shoulder in there" cue has prevented many young hitters from reaching their hitting potential. In our Swing Analysis DVD, we explain the problems with linear mechanics and why rotational mechanics will help them succeed at the plate.

Additional Rotational Hitting Information

Batspeed.com Discussion Board Archives


A. The Beginning
B. Comparison - Baseball and Softball Hitting
C. Players/coaches/authorities
D. Rotational Hitting Aids/drills/cues
E. Linear vs rotational
F. Video analysis


A. Grip & Wrist
B. Launch Position
C. Weight-shift/momentum
D. Lower-body
E. Rotation/Separation
F. Axis of Rotation


A. Initiation
B. Back-arm & Extension
C. Lead-arm & Casting
D. CHP (Circular-Hand-Path)
E. BHT (Bottom-Hand-Torque)
F. PLT & THT (Pre-Launch & Top-Hand-Torque)
G. Hitting the Outside Pitch
H. Contact/Bat Drag/Follow-through
I. Rotational vs Linear Swing Plane



A. The Beginning

Linear vs Rotational cues - Like fitting square pegs in round holes

  • (Video: Mechanics that generate bat speed)

    Purpose of allowing opposing views

    Do we actually teach what we see?
  • The start of my study (Video: CHP & Torque)

    Style vs. Absolutes in the swing
  • All swings will be governed by the same physics principles (the "Absolutes)

    The "Absolutes" to a good swing

    A dads dream come true
  • Hard work and efficient swing mechanics makes up for smaller size

    B. Comparison -baseball and softball hitting

    Pitching vs hitting mechanics (Video: Comparisons)

    Softball swing mechanics same as baseball swing (Video: Comparisons)

    Softball vs baseball hitting
  • Linear MLB hitters lose in softball game against rotational Slow Pitch hitters

    Differences in baseball and golf swing
  • Golf grip induce wrist- roll prior to contact

    Difference, golf & baseball (by Tom Querry)

    C. Players/coaches/authorities

    Mankin // Epstein differences
  • Body rotation still requires efficient transfer mechanics to generate bat speed

    Epstein torque (lower body) vs Mankin torque (upper body)
  • Torque that induces hip rotation - Torque applied at the handle

    Epstein - lead elbow

    Epstein's box - 90 degree elbows vs straighter arm

    Yeager vs Mankin's analysis - Conservation of Momentum

    Robert Adair's linear weight shift vs Mankin's rotation about a stationary axis

    Bat test data and why Robert Adair may have discounted handle torque
  • (Video: Physics and Acoustics of Baseball & Softball Bats)

    Steve Ferroli - Ted Williams & Flattened hands

    Daw - Rubber band analogy
  • (Video)

    Yeager's whip theory vs Mankin's rotational model

    Jim Lefebvre's book - Axis, front-hip vs spine
  • (Video: Giambi momentum & lead leg)

    Zig Ziegler's - Segment deceleration vs Load on rotation causes the deceleration

    Tom Querry - "Whipping action" vs BHT

    Hudgens' knob first vs Mankin's CHP

    Lau To Jack - Firm front leg discussion

    Paul Nyman vs Mankin (1) (Video: Misleading THT)

    Paul Nyman vs Mankin (2) (Video: Misleading THT simulation)

    Dusty Baker - Throwing the bat-head; Crack-of-the-whip theory

    D. Rotational Hitting Aids/drills/cues

    One-handed swings - Physics Lab test findings

    Motion study computer (1) - Findings verify video analysis

    Motion study computer (2)

    Staying inside the ball
  • What does staying inside the ball mean?

    Motion study computer (3) - Torque & pressure seniors

    The plane & the hose drill

    Bullwhip - how it works
  • There is no "Crack of a whip" with a ridged bat

    Power: 50% CHP & 50% Torque - Clarification

    Tom Waz - KE= 1/2(MVV) - Bringing JJA up to speed on Physics Calculations

    E. Linear vs rotational

    Linear vs Rotational - Clarification - What constitutes

    Linear = Low load to rotation
  • Zig Ziegler's segment deceleration vs load induced

    Linear vs Rotational - Pendulum effect vs Whip action
    Problem with Linear Mechanics
  • (Video: "Whip Effect" vs CHP & Torque)

    CHP & Torque vs Whip Model

    Linear vs Rotational mechanics
  • Yeager vs Mankin (Video: pendulum effect v. whip action)

    Linear vs Rotational - Loading (weight on legs) & inward turn

    Linear Mechanics and the minus 11 bats
  • Ted Williams & lighter bats effect on mechanics

    Linear & Fastpitch Softball hitting mechanics - College coaches teach rotational??

    "Swinging too late"
  • Bat speed from linear theories relies on nonexistent whipping action

    F. Video analysis

    Key points I look for in video analysis
  • Requires more than a single view point

    Hips or hands first?
  • Think of rotating hips or the bat-head rearward?
  • (Video: Sosa & Strawberry)

    THT & Bat drag

    Once shoulder rotation is depleted
  • Bat drag - Without THT, bat rotation does not stay in sync with body rotation

    Front view & Side view
  • Reasons for need of each view

    Video Camcorder
  • Recommended camcorders for video analysis with Batspeed's video analysis software - MotionView


    A. Grip & Wrist

    The Grip - Tight or loose?
  • (Video: Bat manufactures test results on the grip)

    Wrist droop
  • Does one "knuckle alignment" work

    Grip & elbow to the belly button

    The Grip - Bat in fingers or palm

    Bonds' Grip (both wrists flex) - straighter wrist & loose grip

    Separate the hands = More torque?

    Wrist snap? Role of the wrist in the swing

    Extension (wrist snap) vs BHT (push/pull of forearms)?

    Premature wrist roll - what causes it

    B. Launch position

    Hands to launch position
  • Hitters have many different styles in how they arrive at launch position
  • (Video: Bonds, Griffey, Sosa - Hands to launch)

    Is "elbow up" a flawed position?

    High back elbow - good position for rotational mechanics, but not for linear

    Inward-turn & PLT to THT mechanics
  • (Video: Bonds/A-Rod side by side)

  • (Video: lead arm of 4 good hitters)

    Hands go back with stride vs. Hiding the hands

    Shrugging lead-shoulder
  • Lead-shoulder rotates 150+ degrees while torso rotates 90

    "Loading defined"

    Inward-turn & pre launch torque
  • (Video: Bonds/A-rod side-by-side of PLT/THT/BHT)

    Inward shoulder turn hides the hands from pitcher
  • Griffey Jr. and David Wright illustrate the importance of the inward turn and hiding the hands(Video)

    Problems with hands creeping forward or into pitcher's view

    C. Weight-shift/momentum

    Pitching vs hitting mechanics - (Video: comparison clips)
  • Pitcher's forward momentum after foot plant not productive for swinging a bat

    Does weight shift = momentum

    Weight shift - Truism or fallacy?

    Weight swift & the "Conservation of Momentum
  • Hip rotation attained from linear weight shift is negligible

    Momentum & Gyro Action
  • Weight on back-foot & discussion of p=mv (Video: Bonds & gyro)

    Is linear motion transferred into angular momentum??
  • Theories on forces that drive hip rotation - (Video: Pathfinder demo; CHP vs. extension)

    What drives hip and shoulder rotation

    Hip rotation
  • Legs/pelvic momentum - Swivel chair analogy

    Welded wheel vs. depleting rotational momentum model

    D. Lower-body

    3 camps on hip rotation - (Video: Giambi - "Whip effect" disproved)

    Role of the hips - 1000 hp engine analogy

    Front foot open or closed

    Why Mark McGwire's lead-leg may remain bent at contact on out-side pitch

    Lead-leg extension
  • Hip rotation straightens led-leg & George Brett & THT

    Body drifting foreword
  • The cure

    Body tilt - Does not necessarily mean weight on back leg

    Batter fully rotates, but bat drags. Why?

    No THT creates bat drag

    Sync body rotation to bat rotation

    E. Rotation/separation

    Questioning shoulder rotation & CHP
  • Mechanics that generate bat speed - (Video: Griffey, Bonds & Rose analysis)

    Rotation & un-shrugging shoulders

    Lead-shoulder shrug discussion

    Hitting the inside and outside pitch mechanics
  • Lead-shoulder rotates 60+ degrees more than back-shoulder - (Video: Pete Rose)

    Hip rotation must stay connected
  • Hip rotation must contribute to shoulder rotation

    Kinetic chain; separation; free wheeling

    Muscles fire in unison
  • Is hips leading the hands due to sequential timing?

    Load causes separation -- No load = one-piece-swing (no separation)

    Role of hips - Does maximum separation equal disconnection?

    Separation/unison - Bowling ball analogy

    Pulling head out - Premature rotation & no separation

    Why not maximum separation - The 3 step swing (1-2-3)

    Hips lead shoulders, but then all rotate in unison
  • At initiation, all the muscles in the legs and torso are contracting in unison

    F. Axis of Rotation

    Axis tilt vs. shoulder rotation - (Video: Bonds' tilt and rotation)
  • add Howard clip

    4 axis of rotation

    Spinning and rotation
  • Revolving door vs. swinging gate (blocked lead-side) - (Video: Rose hip/shoulder comparison)

    Is there a difference between spinning & rotating?
  • (Video: Giambi's lower-body mechanics)

    Weight-shift - Stationary axis vs. back to center


    A. Initiation

    Focusing on the whole swing - Not just forward movements

    Envision the bat's rearward trajectory
  • Subconscious mind will set up a motor program

    Its CHP/THT/BHT - But you can't think your way through the swing

    Sync body rotation to bat-head rotation
  • Think: Rotate heel, rotate bat head

    Obtain your optimum contact position
  • The mind will provide a motor-program to accomplish the body trajectories you envision

    Don't "explode" - Think smooth ever accelerating power

    B. Back-arm & Extension

    "L" position at contact - Few average hitters attain correct position

    Elbow to the belly button - not remaining in the "slot"

    "L" in back-leg and arm
  • What drives back-arm -- (would you rather be hit with boxers hook or jab)
  • (Video: Back arm of 4 good hitters)

    C. Lead-arm & Casting

    Lead-arm - Should boxed elbow extend hands to contact?
  • (Video: Lead arm of 4 good hitters & Pete Rose clip)

    Defining "Casting & Extending

    Role of the lead-arm
  • 4 prong tire wrench analogy - (Video: Rose, Bonds & Burrell)

    Is casting bad?
  • Linear theme: All straight movement is good, all circular is bad

    Does barring = casting?
  • If so, does not "casting" = circular hand path

    Barred arm & shrugging lead-shoulder
  • Role of the lead-arm

    "Keep hands inside the ball" = linear cue?
  • The 'cue' and the resulting hand-path

    What cause counterproductive casting
  • Extending "barred arm" without shoulder rotation

    D. CHP - (Circular-Hand-Path)

    Pulling off the ball
  • "Bat drag" = "Pulling off the ball" - (Video: Rose example)

    How to practice developing a CHP
  • PathFinder & Rubber hose drill

    One-handed drill for generating a CHP

    Hook in hand-path & Tilt-a-whirl analogy

    Why hide your hands?

    E. BHT - (Bottom-Hand-Torque)

    "L" in back-leg and arm
  • What drives back-arm -- (hit with boxers "hook" or "jab")
  • (Video: back arm of four good hitters)

    Lumberjack analogy - Energy expended at contact
  • What powers follow-through

    Rotational Hitting Mechanics that generate bat speed
  • Rearward rotation of lead-shoulder
  • (Video: Hitters Exhibiting Good & Poor BHT)

    BHT - Applying torque by pulling the bottom-hand back
  • (Video: Bonds & Burrell BHT mechanics)

    Tony Gwynn - Full Extension vs "L" position at contact

    Add BHT to CHP
  • Lead-shoulder rotation - torque & CHP - (Video: Griffey analysis)

    Lead-shoulder shrug
  • A form of "scap loading" the lead-shoulder

    Back-arm "L" position - Percentage of torque applied (BHT to THT)

    F. PLT & THT - (Pre-Launch Torque) & (Top-Hand-Torque)

    THT applied in 2 Phases
  • Hitters like Bonds and Sosa accelerate the bat-head rearward in two phases
  • (Videos: Demonstrating THT w/PathFinder & Sosa - PLT to THT)

    Rearward bat-head acceleration
  • Shawn v. Mankin analysis - (Videos: Sosa & overhead clips)

    Bat accelerating from PLT into THT
  • (Videos: PLT to THT mechanics; THT w/PathFinder; Sosa - PLT to THT; 2 Bonds clips)

    THT - same mechanics, different names

    THT-- Key to a great swing

    THT - Thumb of top-hand raking shoulder

    THT & BHT - Do great hitters knowingly apply?

    THT - Rotational hitting & Transfer mechanics
  • When I first saw THT being applied (George Brett)
  • Video:Bonds and Burrell example
  • (Video: Overhead of John Elliot)

    THT & PLT - Sheffield PLT to THT maintains good linkage to rotation

    THT - Keeps lead-arm across chest - "A ballistic motion"

    THT mechanics
  • Shoulder tilt & lowering of the elbow
  • (Add Video: Ryan Howard's mechanics)

    THT & Wrist binds

    Mechanics that can cause Wrist binds

    THT - Can you see THT being applied

    THT & slotting the elbow
  • (Video: Bonds pre-launch torque mechanics)

    PLT - Bat vertical or wrapped

    PLT - Bonds mechanics

    PLT - Loading or un-loading?

    PLT - Discussing advantages of applying PLT

    G. HITTING THE Inside AND Outside Pitch

    Inside/outside mechanics
  • (Video: Lead-shoulder rotates 60+ degrees more than back-shoulder)

    Mark Teixeira - inside/outside mechanics
  • (Video: Lead shoulder rotates 150 while back shoulder rotates 90)

    Hitting the outside pitch

    THT & plate coverage
  • (Video: Reaching the low outside pitch - John & Rose overhead)

    Pulling off the ball
  • Little power to the opposite field are all indicators of "bat-drag"
  • (Video: Rose and plate coverage)

    Big Mac's front knee
  • Why lead-leg remains bent during contact

    The outside pitch - linear vs rotational mechanics

    Outside pitch - BHT mechanics vs PFO

    Ron Gant & Matt Williams - Limitations of BHT on outside pitches

    H. Contact/Bat Drag/Follow-through

    "L" in back-leg and arm
  • What drives back-arm -- (hit with boxers "hook" or "jab")
  • Insert video - 4 good hitters' back arm

    Pulling off the ball not caused by shoulder rotation
  • (Video: Pete Rose)

    Best hit balls pulled foul
  • Linear mechanics = Bat drag - (Video: Sosa)

    Hitting mechanics & the Follow through

  • (Video: WCWS hitters contact position)

    Big Mac's top-hand release
  • Conditions that make releasing the top-hand necessary
  • (Video: Animation - McGwire vs Amateur Hitter)

    Lumberjack analogy - Energy expended at contact

    I. Linear vs Rotational Swing Plane

    Swing plane like a tilted flat disc

    Lead-arm plane & the swing plane

    A-Rod & The Swing Plane
  • Discussion of frontal and across the plate view - (Video: comparison clips)

    PLT & the swing plane
  • Wrist-binds & waves in the swing plane

    THT & the swing plane
  • Rearward force must be inline from lead-arm

    "Swing down vs swing up at the ball"
  • (Video: bat up slope to contact)

    Swing down - But behind not in front

    Looping swing - Collapsing back-side

    Causes of plane flaws - Discussion of initiation problems
  • return to top

    [   SiteMap   ]