Turn Any Cable, Dumbbell, Or Weight Plate Into A Full Rotational-Resistance System
The Gains Hammer is a revolutionary training attachment that eliminates grip fatigue and unlocks rotational resistance for all your upper body exercises., leading to higher muscle activation and less joint strain. Train smarter, build bigger, and protect your joints with every rep.
Get an exclusive discount
We're launching soon. Get an exclusive discount by signing up now!
Reduce Grip Fatigue So Your Target Muscle Can Do The Work
The cushioned hand-support base lets the side of your hand press into a padded surface instead of white-knuckling a handle. This offloads grip tension and redirects force straight through the target muscle, delivering dramatically higher activation in your biceps, triceps, shoulders, and chest without forearm strain holding you back.
Train Supination And Pronation With Smooth, Controlled Rotation
The grooved housing and strap create controlled rotational resistance during curls, presses, and pulldowns. Add isolated supination and pronation work to activate critical forearm and stabilizer muscles rarely trained by traditional attachments.
Build Bulletproof Joints Without Even Thinking About It
Even during non-rotational exercises, the Gains Hammer's design introduces a subtle rotational pull that challenges your stability. This enhances shoulder and elbow joint control, improving performance and resilience across all pressing and pulling motions.
Two Attachments. Endless Exercise Options.
The Gains Hammer includes both a short loop for traditional hammer-style lifts and a long D-ring strap for rotational training. Switch between exercises instantly with total compatibility across cables, dumbbells, and plate-loaded setups.
Full Rotational Resistance In 3 Simple Steps
Step 1
Attach the Gains Hammer to your chosen weight source: cable machine, dumbbell strap, or plate pin.
Step 2
Position your hand with the side pressed firmly into the cushioned base to minimize grip effort.
Step 3
Execute your movement, optionally adding rotation, focusing on smooth control and muscle engagement.
Get an exclusive discount
We're launching soon. Get an exclusive discount by signing up now!
Built to Handle Your Heaviest Sessions.
Constructed from durable aluminum or fiber-filled nylon with a thick rubber exterior for comfort and non-slip performance. Heavy-duty nylon webbing and a solid metal D-ring ensure stability and longevity under serious loads.
One Attachment. Endless Upper-Body Training Options
Strength & Hypertrophy
Supercharge cable and dumbbell isolation work with higher muscle activation and zero grip fatigue.
Rotational Power
Train supination, pronation, and rotational stability for sports like jiu-jitsu, golf, and baseball.
Injury Prevention & Rehab
Support critical forearm rotation movements to combat overuse injuries like tennis elbow and golfer's elbow.
Engineered for Anyone Serious About Upper-Body Training
Coach or Trainer?
Give your clients a biomechanical edge in every upper-body session.
Recovering From Injury?
Integrate functional rotation work for safer, stronger elbows, wrists, and shoulders.
Experienced Lifter?
Unlock muscle activation patterns unattainable with standard gym attachments.
Where Muscle Science Meets Real-World Performance
Created by Dr. Michael Kamalu, founder of Dr. Gains and a leader in evidence-based strength innovation, the Gains Hammer was engineered to solve one of the most common limitations in upper-body training: grip fatigue and lack of rotational loading. Backed by over 250,000 engaged followers on YouTube and years of biomechanical research, Dr. Kamalu and his team design tools that merge muscle science, injury prevention, and performance optimization.
Get an exclusive discount
We're launching soon. Get an exclusive discount by signing up now!
Turn Any Cable, Dumbbell, Or Weight Plate Into A Full Rotational-Resistance System
The Gains Hammer is a revolutionary training attachment that eliminates grip fatigue and unlocks rotational resistance for all your upper body exercises., leading to higher muscle activation and less joint strain. Train smarter, build bigger, and protect your joints with every rep.
Get an exclusive discount
We're launching soon. Get an exclusive discount by signing up now!
Reduce Grip Fatigue So Your Target Muscle Can Do The Work
The cushioned hand-support base lets the side of your hand press into a padded surface instead of white-knuckling a handle. This offloads grip tension and redirects force straight through the target muscle, delivering dramatically higher activation in your biceps, triceps, shoulders, and chest without forearm strain holding you back.
Train Supination And Pronation With Smooth, Controlled Rotation
The grooved housing and strap create controlled rotational resistance during curls, presses, and pulldowns. Add isolated supination and pronation work to activate critical forearm and stabilizer muscles rarely trained by traditional attachments.
Build Bulletproof Joints Without Even Thinking About It
Even during non-rotational exercises, the Gains Hammer's design introduces a subtle rotational pull that challenges your stability. This enhances shoulder and elbow joint control, improving performance and resilience across all pressing and pulling motions.
Two Attachments. Endless Exercise Options.
The Gains Hammer includes both a short loop for traditional hammer-style lifts and a long D-ring strap for rotational training. Switch between exercises instantly with total compatibility across cables, dumbbells, and plate-loaded setups.
Full Rotational Resistance In 3 Simple Steps
Step 1
Attach the Gains Hammer to your chosen weight source: cable machine, dumbbell strap, or plate pin.
Step 2
Position your hand with the side pressed firmly into the cushioned base to minimize grip effort.
Step 3
Execute your movement, optionally adding rotation, focusing on smooth control and muscle engagement.
Get an exclusive discount
We're launching soon. Get an exclusive discount by signing up now!
Built to Handle Your Heaviest Sessions.
Constructed from durable aluminum or fiber-filled nylon with a thick rubber exterior for comfort and non-slip performance. Heavy-duty nylon webbing and a solid metal D-ring ensure stability and longevity under serious loads.
One Attachment. Endless Upper-Body Training Options
Strength & Hypertrophy
Supercharge cable and dumbbell isolation work with higher muscle activation and zero grip fatigue.
Rotational Power
Train supination, pronation, and rotational stability for sports like jiu-jitsu, golf, and baseball.
Injury Prevention & Rehab
Support critical forearm rotation movements to combat overuse injuries like tennis elbow and golfer's elbow.
Engineered for Anyone Serious About Upper-Body Training
Coach or Trainer?
Give your clients a biomechanical edge in every upper-body session.
Recovering From Injury?
Integrate functional rotation work for safer, stronger elbows, wrists, and shoulders.
Experienced Lifter?
Unlock muscle activation patterns unattainable with standard gym attachments.
Where Muscle Science Meets Real-World Performance
Created by Dr. Michael Kamalu, founder of Dr. Gains and a leader in evidence-based strength innovation, the Gains Hammer was engineered to solve one of the most common limitations in upper-body training: grip fatigue and lack of rotational loading. Backed by over 250,000 engaged followers on YouTube and years of biomechanical research, Dr. Kamalu and his team design tools that merge muscle science, injury prevention, and performance optimization.
Get an exclusive discount
We're launching soon. Get an exclusive discount by signing up now!