KYNVALE
Nimbra Grip Trainer
$36.00
$57.00
SAVE
37%
Train each finger on its own
Adjustable 5–60 kg resistance
Padded palm bar, no dig
Grips that hold to round three
Gi bag, desk, pocket
No batteries, no setup
30-Day Money-Back Guarantee.
If your grips don't last longer in rolls, one email gets your money back.
If your grips don't last longer in rolls, one email gets your money back.
Free shipping · dispatched within 1–2 business days
Will grip training actually carry over to gi grips?
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Nothing replaces mat time — gripping cloth is a skill you build on the mats. What carries over is finger strength and endurance. It's the reason climbers walk into their first gi class with grips people can't pry off. Nimbra builds the capacity; rolling teaches your hands what to do with it.
Why not just hang off a gi over a pull-up bar for free?
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Do both. Gi hangs are great and free — for the hour a day you're near a bar. Nimbra is for the other fifteen: the desk, the couch, the commute, where your grip could be quietly compounding and right now isn't.
How is this different from a Captains of Crush gripper?
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A crusher trains four fingers as one unit at one fixed weight, and you buy a ladder of them as you get stronger. Nimbra gives each finger its own adjustable piston through one range — which matters, because gi grips don't fail at the whole hand, they fail at the weakest finger.
Is this just another Instagram dropship gadget?
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Fair question — the category is crawling with them. Kynvale also builds baseball training gear and has been running for years. The 30-day guarantee has no fine print: train with it, and if your grips don't last longer in rolls, one email gets your money back.
What if I'm coming back from a hand or wrist injury?
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Because each finger presses its own piston, you can keep the healthy fingers working and leave the recovering one out entirely — then dial the unit down to its lightest setting when you bring it back, once your physio clears you to train.
Shipping and returns?
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Shipping is free on every order, and orders are dispatched within 1–2 business days with tracking. 30-day money-back guarantee from the day yours arrives — email support@kynvale.com and we'll sort it, no return interrogation.
ROUND THREE
Every grappler knows the exact moment.
Posture broken, grip deep, the whole round going your way — then your forearms fill with concrete and your fingers start peeling open one at a time, pinky first, while your brain is still screaming hold. There is no technique for hands that won't close.
“I gassed out in my first tournament in fight 2 of 4 because I kept hold of a failed cross collar for too long.”
Marcus — first comp season
Not out-skilled. Out-gripped — with two fights still on the card.
They’re the reason we built it.
Grapplers kept describing the same failure — different words, same two fingers. Nimbra exists because of messages like these.
Grip fatigue
“I've noticed my hands fatiguing a lot while holding on to lapels and sleeves etc.”
Dane
— Gi player, 4 years
Small hands
“So one of my main weaknesses has always been grip strength. I have small hands and thin forearms.”
Sam
— Lightweight, small hands
Underdeveloped grip
“So like a lot of people I'm sure, my grip is probably a bit under developed for gi work.”
Alex
— Two years in the gi
Injury layoff
“I am out for another 4-5 months recovering from a broken ankle... I'm worried about losing my grip strength.”
Tommy
— Coming back from surgery
WHY YOUR GRIPPER ISN’T WORKING
Your grip trainer is training the wrong fingers.
Crushers squeeze four fingers as one unit — your index and middle do the work, your ring and pinky ride along. Then a sleeve grip loads exactly the two fingers that never trained.
Four independent spring pistons — each finger presses its own, so your pinky can’t hide behind your index
Padded palm bar keeps heavy sets from carving a spring handle into your hand
One unit replaces the ladder of fixed-weight crushers you were eventually going to buy
TAP A FINGER — SEE WHAT YOU’RE NOT TRAINING
Pinky
Ring
Middle
Index
WEAKERSTRONGER
The first to peel open on every sleeve grip — and the finger crushers never actually train. On Nimbra it presses its own piston, so it can't coast.
Train My Grips
Free shipping · 30-day money-back guarantee — if your grips don't last longer in rolls, one email gets your money back.
NIMBRA VS THE GYM BAG GRAVEYARD
Gi grips fail one finger at a time. Train them that way.
| NIMBRA | Spring crushers | Grip rings / balls | |
|---|---|---|---|
| Trains each finger separately | |||
| Trains each finger individually | |||
| One unit covers light to heavy | Buy a ladder | ||
| Padded palm bar for heavy sets | |||
| Fits gi bag / desk / pocket |
Train My Grips
Free shipping · 30-day money-back guarantee — if your grips don't last longer in rolls, one email gets your money back.
Lives where your training does.
Matside between rounds. Gi bag on the way home. Desk drawer for the other fifteen hours.
THE OTHER FIFTEEN HOURS
You train one hour a day. Grip can compound in the other fifteen.
Gi hangs at the gym are superb and free. But grip is one of the few attributes you can build in stolen minutes — and Nimbra lives where the minutes are: the gi bag, the desk, next to the couch.
MAT NIGHTS
Rolling spends grip. You walk off the mats with your hands emptied.
DESK, COUCH, COMMUTE
Short sets on Nimbra in the hours BJJ never touches. No setup, no batteries.
THURSDAY’S ROLLS
Grips still holding deep into round three — that’s the proof.
THE END STATE
Be the grip nobody wants to deal with.
“My grips are one of my strongest definers when I roll with people.”
Kier — 16 years of grip work
Grips that hold until you decide to let go change how you roll — you stop rationing your hands and start spending them. And if injury benches you, per-finger isolation means you keep what you built: work the healthy fingers, leave the recovering one out, bring it back light when your physio clears it.
Train My Grips
Free shipping · 30-day money-back guarantee — if your grips don't last longer in rolls, one email gets your money back.
60 days on the mats. Zero risk.
Train with Nimbra for 60 days. If you don't feel the difference in your grips deep into rounds, email us and we'll refund you in full. You don't need a reason and you won't get an argument.
FROM THE FOUNDER
I built the tool I needed.
My grips have always been the first thing to go — I'd have the position won and lose it because my hands gave out before my technique did. Everything I tried was either a crusher that hammered my strong fingers and ignored the ones that actually fail, or a $10 toy behind an Instagram ad.
Nimbra is the trainer I wanted in my own gi bag, and it's been in there every day since the first sample arrived.
If you need anything, every email to support@kynvale.com comes straight to my phone. And if it's not for you, send one and I'll refund you myself.
Nathan
Founder, Nimbra