Turn Any Cable, Dumbbell, Or Weight Plate Into A Full Rotational-Resistance System
The Gains Hammer eliminates grip fatigue, adds rotational resistance to every upper-body lift you already do, and unlocks new movements you've never been able to load before. Higher muscle activation, less joint strain, more exercises in your arsenal. Clip it on and every rep works harder.
75+ exercises · Rated for 300+ lbs · Ships within weeks
Reserve your spot at the best price we'll ever offer
Drop your email and get early access when we launch, plus our deepest VIP discount — available only to this list before launch.
Supination. Pronation. Shoulder Rotation. Fully Loaded.
Try loading rotation on a normal cable setup and you get uneven resistance and a cable dragging across your wrist. The Gains Hammer's grooved cam fixes both — mirroring your physiological strength curve through dozens of rotational movements, something that previously required specialized machines. Isolate rotation on its own, or add it to curls, extensions, raises, and flies for activation traditional equipment can't reach.
Reduce Grip Fatigue So Your Target Muscles Can Do The Work
The cushioned base lets the sides of your hand press into deep padding instead of white-knuckling a handle. This offloads grip tension and redirects force straight through the target muscle for dramatically higher activation, and your biceps, shoulders, and back finally work to failure — not your grip.
One Attachment. Every Setup.
A cable machine unlocks the widest exercise variety, but you're not locked into one. The Gains Hammer connects to dumbbells and weight plates with custom accessories — delivering full rotational training whether you're in a commercial gym or a corner of your garage.
Bulletproof Joints, Built Automatically
Even on non-rotational lifts, the Gains Hammer's design adds a subtle rotational challenge your shoulders, elbows, and wrists have to control. Every press and pull quietly doubles as stability work — resilience you build without programming a single extra set.
Two Attachment Sites. Zero Compromises.
A short loop for hammer-style lifts — compact enough for full range of motion while standing, where standard attachments run out of room. A D-ring strap for rotational training. Switch between them in seconds, across cables, dumbbells, and plate-loaded setups — one tool that never makes you choose.
Full Rotational Resistance In 3 Simple Steps
Clip it on
Cable, dumbbell strap, or plate pin.
Press, don't grip
The side of your hand presses into the cushioned base, so tension goes straight to the target muscle — not into holding on.
Rotate and repeat
Add rotation to any movement, isolate it completely, or run hammer-style lifts — resistance, activation and comfort no other attachment can match.
VIP spots will run out before launch. Reserve yours.
Deepest discount at launch · Early access · Ships within weeks
Built to Handle Your Heaviest Sessions
Engineered fiber-reinforced core, ultra-thick rubber exterior, and a 300+ lb rating at both attachment sites. However heavy you train, the Gains Hammer isn't the weak link.
One Attachment. Endless Upper-Body Training Options
Strength & Hypertrophy
Supercharge your isolation work with greater muscle activation—and none of the grip fatigue or pressure points that end your sets early.
Rotational Power
Rotation is one of the body's most fundamental movement patterns—and the one nearly every training program overlooks. The Gains Hammer trains every upper-body rotation there is from forearms to shoulders, unlocking new athletic power and the balanced growth that conventional lifting leaves behind.
Injury Prevention & Rehab
Strengthen the rotational movements everyday training neglects and build resilient shoulders, elbows, and wrists—your best defense against overuse injuries like tennis elbow, golfer's elbow, and rotator cuff strain.
Engineered for Anyone Serious About Upper-Body Training
Coach or Trainer?
Program a movement pattern your clients can't train anywhere else — and get them results their last trainer couldn't.
Athlete?
Every throw, swing, and grapple starts with rotation. Train it directly and gain an edge over the competition.
Experienced Lifter?
You've run out of ways to make a handle or straight bar harder. Reach the angles and movements no other attachment can hit.
Why I Built This
I'm Michael Kamalu — founder of Dr. Gains, where over 260,000 people follow my work on YouTube. A 100th percentile MCAT score earned me a full scholarship to the Mayo Clinic School of Medicine, where I trained for two years before leaving to build the first of three 7-figure businesses in health & fitness.
For years, the same frustrations plagued my own training, my clients', and my audience's.
1. There was no real way to load rotation, despite being critical for muscle growth, athletic performance, and injury prevention. Try it, and you get uneven resistance and a cable digging across your wrist.
2. Hammer-type training was broken. Grip stole activation and gave out before the target muscle did, with pressure points that turned heavy sets into pain management. And too-long attachments made training full range of motion impossible (usually eliminating the all-important lengthened fiber range!).
Every fix required a specialized machine or didn't exist at all. So I spent over three years, 17 prototypes, and exhaustive research designing the Gains Hammer myself — every curve, groove, and layer of it — until one attachment solved every issue.
— Michael
Last chance to be first.
300,000+ people hear about this at launch (Michael's audience). There's only a few hundred VIP spots.
Turn Any Cable, Dumbbell, Or Weight Plate Into A Full Rotational-Resistance System
The Gains Hammer eliminates grip fatigue, adds rotational resistance to every upper-body lift you already do, and unlocks new movements you've never been able to load before. Higher muscle activation, less joint strain, more exercises in your arsenal. Clip it on and every rep works harder.
75+ exercises · Rated for 300+ lbs · Ships within weeks
Reserve your spot at the best price we'll ever offer
Drop your email and get early access when we launch, plus our deepest VIP discount — available only to this list before launch.
Supination. Pronation. Shoulder Rotation. Fully Loaded.
Try loading rotation on a normal cable setup and you get uneven resistance and a cable dragging across your wrist. The Gains Hammer's grooved cam fixes both — mirroring your physiological strength curve through dozens of rotational movements, something that previously required specialized machines. Isolate rotation on its own, or add it to curls, extensions, raises, and flies for activation traditional equipment can't reach.
Reduce Grip Fatigue So Your Target Muscles Can Do The Work
The cushioned base lets the sides of your hand press into deep padding instead of white-knuckling a handle. This offloads grip tension and redirects force straight through the target muscle for dramatically higher activation, and your biceps, shoulders, and back finally work to failure — not your grip.
One Attachment. Every Setup.
A cable machine unlocks the widest exercise variety, but you're not locked into one. The Gains Hammer connects to dumbbells and weight plates with custom accessories — delivering full rotational training whether you're in a commercial gym or a corner of your garage.
Bulletproof Joints, Built Automatically
Even on non-rotational lifts, the Gains Hammer's design adds a subtle rotational challenge your shoulders, elbows, and wrists have to control. Every press and pull quietly doubles as stability work — resilience you build without programming a single extra set.
Two Attachment Sites. Zero Compromises.
A short loop for hammer-style lifts — compact enough for full range of motion while standing, where standard attachments run out of room. A D-ring strap for rotational training. Switch between them in seconds, across cables, dumbbells, and plate-loaded setups — one tool that never makes you choose.
Full Rotational Resistance In 3 Simple Steps
Clip it on
Cable, dumbbell strap, or plate pin.
Press, don't grip
The side of your hand presses into the cushioned base, so tension goes straight to the target muscle — not into holding on.
Rotate and repeat
Add rotation to any movement, isolate it completely, or run hammer-style lifts — resistance, activation and comfort no other attachment can match.
VIP spots will run out before launch. Reserve yours.
Deepest discount at launch · Early access · Ships within weeks
Built to Handle Your Heaviest Sessions
Engineered fiber-reinforced core, ultra-thick rubber exterior, and a 300+ lb rating at both attachment sites. However heavy you train, the Gains Hammer isn't the weak link.
One Attachment. Endless Upper-Body Training Options
Strength & Hypertrophy
Supercharge your isolation work with greater muscle activation—and none of the grip fatigue or pressure points that end your sets early.
Rotational Power
Rotation is one of the body's most fundamental movement patterns—and the one nearly every training program overlooks. The Gains Hammer trains every upper-body rotation there is from forearms to shoulders, unlocking new athletic power and the balanced growth that conventional lifting leaves behind.
Injury Prevention & Rehab
Strengthen the rotational movements everyday training neglects and build resilient shoulders, elbows, and wrists—your best defense against overuse injuries like tennis elbow, golfer's elbow, and rotator cuff strain.
Engineered for Anyone Serious About Upper-Body Training
Coach or Trainer?
Program a movement pattern your clients can't train anywhere else — and get them results their last trainer couldn't.
Athlete?
Every throw, swing, and grapple starts with rotation. Train it directly and gain an edge over the competition.
Experienced Lifter?
You've run out of ways to make a handle or straight bar harder. Reach the angles and movements no other attachment can hit.
Why I Built This
I'm Michael Kamalu — founder of Dr. Gains, where over 260,000 people follow my work on YouTube. A 100th percentile MCAT score earned me a full scholarship to the Mayo Clinic School of Medicine, where I trained for two years before leaving to build the first of three 7-figure businesses in health & fitness.
For years, the same frustrations plagued my own training, my clients', and my audience's.
1. There was no real way to load rotation, despite being critical for muscle growth, athletic performance, and injury prevention. Try it, and you get uneven resistance and a cable digging across your wrist.
2. Hammer-type training was broken. Grip stole activation and gave out before the target muscle did, with pressure points that turned heavy sets into pain management. And too-long attachments made training full range of motion impossible (usually eliminating the all-important lengthened fiber range!).
Every fix required a specialized machine or didn't exist at all. So I spent over three years, 17 prototypes, and exhaustive research designing the Gains Hammer myself — every curve, groove, and layer of it — until one attachment solved every issue.
— Michael
Last chance to be first.
300,000+ people hear about this at launch (Michael's audience). There's only a few hundred VIP spots.