The fin meets your arm when the selected boundary is crossed.
Real-time trail-arm feedback
Hear the mistake. Feel the fix.
Build the arm structure great swings have.
Through sound and touch, Arm Shark tells you the moment your trail arm over-bends and your swing loses width. Nothing holds you in place. You make the correction, so the new movement belongs to you.
$99.00
Regular price
$129.00
Founder’s Discount Applied
Limited first production run
Initial production run: available for delivery in the United States only. International availability is coming soon.
Arm Shark, all three fins, carry bag, and permanent training access included.
No batteries, app, or subscription
Fitting and drill training included
Why Arm Shark is different
The magnetic connection releases with a click you can identify.
You make the movement and the correction yourself.
Move from Amateur to Pro to Champion as your pattern improves.
The mistake starts earlier than you think
The downswing gets stuck before it starts.
When the trail arm lowers and over-bends, width can disappear before the club changes direction. The downswing may already be solving a problem created in the backswing.
Backswing
The trail arm over-bends.
The elbow folds beyond the intended range as the body continues to turn.
At the top
Width disappears.
The hands and arms move closer to the body, shrinking the space needed to transition.
Transition
The club can get steep or stuck.
The body may need to create room or reroute the club before impact.
The strike
Compensation takes over.
The strike now depends on a last-second solution.
Inside takeaway
Fat contact
Toe-deep divots
Lost speed
Pop-up drives
Poor consistency
Fat contact
Toe-deep divots
Lost speed
Pop-up drives
Poor consistency
Arm Shark catches the first break in the chain, while the movement is still fresh enough to change.
Feedback during the movement
Hear it. Feel it. Change the next rep.
The fin touches your bicep and its magnetic connection releases when your trail arm crosses the selected range. The contact and click tell you exactly which repetition changed.
Swing
Make your motion. Arm Shark does not hold or redirect your arms.
Feel + hear
The fin contacts your arm and the magnetic connection releases when the selected range is crossed.
Correct
Use the signal to make the next repetition wider and quieter.
One system. Three feedback ranges.
Start where you are. Earn the next fin.
Begin with the Amateur fin, progress to Pro, and finish with Champion as your trail-arm pattern becomes more consistent.
More guidanceMore ownership
Amateur
Start here to learn the movement boundary and build awareness.
Pro
Tighten the standard as your trail-arm pattern becomes more repeatable.
Champion
Train with the smallest margin, then carry the feel beyond the device.
All three fins are included with one Arm Shark. They are the training path, not product variants.
Inside the box
The complete Arm Shark system.
One adjustable device, all three progressive fins, a carry bag, and permanent training access. Everything you need to start building better trail-arm structure.
Your Arm Shark system
Arm Shark device
Adjustable strap and magnetic fin channel
Amateur, Pro, and Champion fins
Three progressive feedback ranges
Arm Shark carry bag
Keeps the complete system together
Permanent training access
Fitting, how-to, and guided drill videos
Training included
Learn the fit. Start the drills.
Scan the QR code on Arm Shark for fitting, how-to, and guided drill videos included with your purchase.
Designed from measured movement
Train the trail-arm pattern great players actually use.
Athletic Motion Golf uses 3D motion data to compare how skilled and amateur golfers move. Arm Shark translates one trail-arm insight into a signal you can feel and hear on every repetition.
No camera, sensor, app, or launch monitor required.
Made here. From start to finish.
Every part. Every build. American made.
Every component is sourced in the USA. Every Arm Shark is made and assembled here, too. That gives us a closer connection to the people, materials, and quality behind every unit.
Made, sourced & assembled in the USA
Made in the USA
Before your first swing
Arm Shark questions, answered.
Everything you need to understand the fit, feedback, and included training path.
How does Arm Shark give feedback?
When your trail arm crosses the range set by the selected fin, the fin touches your bicep and its magnetic connection releases. You feel the contact and hear the click during the repetition.
Does it force my arms into position?
No. Arm Shark does not brace, hold, or redirect your arms. It reports when the selected boundary is crossed, then you make the correction on the next repetition.
Which arm do I wear it on?
Wear it on your trail arm: the right arm for a right-handed golfer and the left arm for a left-handed golfer. Follow the included fitting guidance before training.
Will the adjustable strap fit me?
The adjustable system has been fitted successfully on junior golfers through 6'8" professional athletes. Correct placement matters, so fitting guidance is included with every purchase.
Do I need batteries, an app, or a subscription?
No. Arm Shark’s feedback is physical and audible. No battery, sensor, app, launch monitor, or subscription is required.
What comes with my Arm Shark?
You receive the adjustable Arm Shark device, Amateur, Pro, and Champion fins, a carry bag, and permanent access to fitting, how-to, and guided drill videos.
How do I move from one fin to the next?
Use the included training guidance and progress only when your swings stay consistently quiet at the current level. If the fin releases on nearly every repetition, slow down or return to the previous level until you own the movement.
Where is Arm Shark available?
For the initial production run, Arm Shark is available for delivery within the United States only. International shipping is not available yet, but expanded availability is coming soon.
Your next repetition can tell you more
There’s better golf ahead.
Train the moment width disappears, then repeat the movement until the click goes quiet.
$99.00
Regular price
$129.00
All three fins and training access included.