Forearms that show.
Five minutes a day.
The Knurl forearm trainer loads the whole forearm through multi-directional resistance. Grip strength, size and vascularity from a tool that fits in your pocket.
- check_circleFull forearm activation: flexors, extensors and stabilizers in one set, not just the crush of a gripper
- check_circleVisible size in 30 days: direct daily volume on the muscles compound lifts leave behind
- check_circleUnlocks your lifting potential: when the bar stops slipping, every pull gets more reps
- check_circleOne piece, no springs: nothing to snap, nothing to set up, works at the desk, gym or couch
Rethinking forearm training
Grippers train one motion. Forearms are built by many.
Every angle, every set
Squeeze, twist, roll and hold. The load changes with each hand position, so flexors, extensors and stabilizers all get worked.
Five minutes that actually happen
Pocket-sized means it is with you. The best forearm program is the one you do every day, wherever you are.
Built for progress
Slow reps for size, fast reps for endurance, holds for grip. The same ball keeps giving you somewhere to go.
Five minutes a day. For the rest of your lifts.
Forearms are the muscles compound lifts leave behind. Give them direct, multi-angle work every day and the bar stops slipping, the sleeves get tighter and every pull gets more reps.
Shop the trainerLoved by lifters
What people say after their first weeks with Knurl.
“My grip strength has definitely improved and my forearms are starting to look more defined. I like that I can use it pretty much anywhere, not just at the gym.”
Hudson L.Verified customer
“I do pilates a few times a week but my forearms always looked soft. Started using this for 5 minutes a night. About 3 weeks in my roommate pointed out my arms looked more defined.”
Kimberly L.Verified customerHear it from a customer: 10 seconds of Knurl in use, in their own hands.
Customer videoVerified purchaseBuilt for the muscles lifts leave behind.
Knurl started with a simple frustration: grippers train one motion, and forearms never grow from it. So we built a tool that loads the whole forearm, fits in a pocket and takes five minutes a day. No springs, no setup, no excuses.
Shop Knurl