Forearm exercises for pitchers train the flexor-pronator mass, the muscle group that acts as a dynamic stabiliser against valgus load at the medial elbow.
Wrist curls, isolated pronation and supination, rice bucket work and band flexor drills are the core movements, run three to four times a week and timed around your start.
The reason this matters is uncomfortable. Elbow forces during pitching routinely exceed the levels that cause UCL failure in cadaver studies.
Your ligament is operating past its tested breaking point on every high-intent throw, and the flexor-pronator mass is what absorbs some of that load before it reaches the ligament.
Here is the protocol, the honest evidence behind it, and the programming detail every other guide leaves out.
What the Research Actually Shows
Most articles on this topic claim forearm training prevents Tommy John surgery. The evidence does not support saying that outright, and you should know where the line sits.
What is established
The flexor-pronator mass has been demonstrated as a dynamic stabiliser of the elbow against valgus loads. Medial elbow gapping is a known risk factor for UCL injury.
What is not established
That forearm strengthening reliably reduces that gapping. A 2025 study ran an eight-week forearm-strengthening programme on collegiate baseball pitchers and measured medial elbow gapping under ultrasound. The programme produced a measurable increase in forearm girth and grip strength. The average medial elbow gap under static valgus load was statistically unchanged.
The Forearm Muscles Pitchers Need to Train
The flexor-pronator mass originates at the medial epicondyle, the same spot the UCL attaches, which is why it can contribute to stability there.
Four muscles matter most:
- Flexor carpi ulnaris. The most direct contributor to medial elbow stability. Research has shown certain exercises activate it above the rest of the flexor-pronator group.
- Flexor digitorum superficialis. Also preferentially activated by specific movements, and heavily involved in ball grip.
- Pronator teres. Drives forearm pronation, which happens violently through ball release.
- Wrist extensors. Not part of the flexor-pronator mass, but neglecting them creates the imbalance that produces lateral elbow pain.
7 Forearm Exercises for Pitchers
Here are the top few exercises that protect pitcher’s elbow:
1. Wrist Curl
The foundation movement for the flexors.
- How: Forearm supported on a bench or thigh, palm up, light dumbbell. Lower the weight by letting the wrist extend, then curl it back up.
- Reps: 3 sets of 15
- Load: Light. 5 to 10 pounds is plenty for most pitchers.
- Key point: Control the lowering phase. The eccentric is where tendon adaptation happens.
2. Reverse Wrist Curl
Balances the flexor work and protects the lateral elbow.
- How: Same position, palm down. Lift the back of the hand toward the ceiling.
- Reps: 3 sets of 15
- Load: Roughly half what you use for wrist curls.
3. Isolated Pronation and Supination
The most pitching-specific movement in this list.
- How: Elbow at 90 degrees, tucked at your side. Hold a light dumbbell at one end so the weight is off-centre. Rotate the forearm palm-down, then palm-up, keeping the shoulder completely still.
- Reps: 3 sets of 15 each direction
- Key point: Only the forearm moves. If your shoulder is rotating, the weight is too heavy.
Pronation is what your forearm does through ball release. This trains it under load in isolation, which nothing else in a normal lifting programme does.
4. 90/90 Position Curl
A standard exercise modified to match the throwing position.
- How: Shoulder abducted to 90 degrees, elbow at 90 degrees, arm in the pitching position. Slowly extend the elbow to straight, then return.
- Reps: 3 sets of 12
- Why: Trains the arm through the position it occupies during the throw rather than at your side.
5. Rice Bucket Work
Used by physical therapists for decades, and the best endurance option here.
- How: Bucket of uncooked rice deep enough to bury your forearm. Scoop, punch through, rotate the hand, squeeze and release, open and close the fingers.
- Duration: 60 to 90 seconds per movement, 3 to 4 movements.
- Why: The resistance is omnidirectional and continuous, which builds endurance without loading the elbow in a single plane.
Full protocol in our rice bucket forearm workout guide.
6. Band Flexor and Extensor Work
The low-load option for between-start days.
- How: Light resistance band anchored below hand height for flexion, above for extension. Also loop a band around the fingertips and open the hand against it.
- Reps: 2 to 3 sets of 20
- Why: Enough stimulus to maintain strength without adding recovery cost.
7. Rotational Forearm Training
Covers pronation, supination, flexion and extension in one continuous movement.
- How: Rotational forearm tools load the hand and forearm through a full turning arc rather than one fixed direction.
- Reps: 3 sets, both directions, moderate load.
- Why: The pitching forearm works through rotation under load, and single-plane exercises miss most of it. A forearm trainer that loads flexors and extensors together in a wringing motion covers the pronation and supination demand alongside the flexion work, which is more time-efficient than running four separate exercises.
How to Program Forearm Work Around Your Start
This is the section every other guide skips, and it is the one that determines whether you actually do the work.
Pitchers live on a five-day cycle. Medical guidance is explicit that these exercises should not be performed immediately before an outing, because fatigued forearm musculature is worse than untrained forearm musculature when the elbow needs stabilising.
A five-day starter cycle
|
Day |
Forearm work |
|
Day 1 (start day) |
None before. Light band flexor and extensor work after, if anything. |
|
Day 2 |
Recovery only. Rice bucket, 60 seconds per movement. Stretching. |
|
Day 3 |
Heaviest session. Wrist curls, reverse curls, pronation and supination, 90/90 curls. |
|
Day 4 |
Moderate. Rotational work and band drills. |
|
Day 5 |
Light band work only. Stop 24 hours before the start. |
Why In-Season Forearm Strength Declines
Pitchers lose forearm strength and tissue elasticity across a season. Throwing volume accumulates, recovery time shrinks, and nobody adds work to offset it.
That decline matters because the flexor-pronator mass is doing stabilising work on every throw. Weaker and stiffer tissue in August is doing that job worse than it was in April, at exactly the point in the season where innings pitched are highest.
Increasing forearm training volume between starts is the most direct counter. It is also why the light maintenance days in the table above are not optional filler. They are the part that holds the line.
Track it. Test your grip strength monthly with the same method and compare against your April baseline.
Testing grip strength at home takes five minutes and gives you a number that tells you whether you are maintaining or sliding. Compare it against normative grip strength data for your age to know where you stand.
Stretching and Recovery
Strength work without mobility work builds a stiff forearm, and stiffness increases the load transmitted to the elbow.
- Before throwing: dynamic movement. Wrist circles, controlled flexion and extension, light band work. Never static stretching before an outing.
- After throwing: static. Extend the arm, palm up, gently pull the fingers toward the floor to stretch the flexors. Flip the hand and pull down to stretch the extensors. Hold 20 to 30 seconds each.
- Then cool it. Ice or a cool compress on the elbow and shoulder for 10 to 15 minutes.
Tight forearms and triceps increase stress on the joint. Five minutes after every outing does more over a season than any single strengthening session.
If you already have pain on the inside of the elbow, these golfer's elbow exercises cover the rehab progression, though persistent medial elbow pain in a pitcher needs assessment rather than self-management.
What Forearm Training Will Not Do
Being straight about this is what separates useful information from marketing.
- It will not stop you needing Tommy John surgery on its own. UCL injury is multifactorial and throwing volume is a bigger lever than forearm strength.
- It will not add velocity. Velocity comes from the kinetic chain, ground up. The forearm is the last link, not the engine.
- It will not fix mechanics. A pitcher with poor sequencing is loading the elbow badly regardless of forearm girth.
- It will not replace rest. The single most protective thing a young pitcher can do is throw less.
What it does do is maintain the tissue that stabilises the joint, hold your strength through a season instead of losing it, and give you a margin you would not otherwise have.
Forearm Exercises for Pitchers FAQs
How often should pitchers train forearms?
Three to four sessions a week in season, timed away from starts. Never immediately before an outing.
Do forearm exercises prevent Tommy John surgery?
They likely contribute as part of a broader approach. The strongest study on the question found increased forearm girth and grip strength but no statistically significant change in medial elbow gapping, so the claim should not be made outright.
Should pitchers use hand grippers?
Sparingly. Grippers build crush strength, which is the least pitching-specific forearm quality. Pronation, controlled flexion and endurance matter more.
How heavy should wrist curls be for pitchers?
Light. 5 to 10 pounds for most. This is stabiliser training, not hypertrophy work.
Does the rice bucket actually work?
Yes, for endurance and omnidirectional resistance. It has been standard in baseball rehab for decades for good reason.
Can forearm training cause elbow pain?
Yes, if you only train the flexors. Balance every flexor exercise with extensor work.
When should a pitcher see a doctor?
Any medial elbow pain that persists beyond a few days of rest, any pain during the throw itself, or any loss of velocity or control alongside discomfort.
Train the Link That Takes the Load
Your UCL is operating beyond its tested failure point on every high-intent throw. The flexor-pronator mass is one of the few things you control that sits between that force and the ligament.
Train it consistently, time it around your starts, balance the flexors against the extensors, and keep testing so you know whether you are holding your strength or losing it across the season.
Gripzilla builds the forearm and grip training equipment that makes this work repeatable.
Rotational forearm trainers that cover pronation and supination in one movement, progressive resistance for off-season building, and the tools to test where you actually stand.
