The thick handles called “Fat Gripz” displaces the stress caused from resistance training from your joints and directs it to the muscle itself. This is thanks to the thick surface area and the evenly spread weight over the hand.
This is indeed true
I am here to confirm that this is indeed true, as I personally have used Fat Gripz while doing standing bicep curls. Generally when doing the exercise, I feel a tremendous amount of pain which hampers my movement, now thanks to Fat Gripz that pain is gone! / Martin Gergov
And more for Faaaat Gripz
Fat Gripz are the new worldwide training phenomenon that help add muscle and strength (especially big arms) to your body in record time. They have been described as “the biggest thing to happen to weight training in the last decade”.
Thick bars make your hands, fingers and forearms so much stronger that your body can finally stop “holding back” the strength and muscle gains in your uppers arms, back and chest.
Less imbalances and injuries
Thick bars spread the weight over a larger area of the hand (just imagine bench pressing with a thick bar compared to a standard skinny bar). Many trainers credit this with making training safer and less likely to cause injury.
They also make the forearms extensors (the muscles on the top of the forearm) and forearm flexors (the muscles on the bottom) work more evenly which can help avoids imbalances, weaknesses and injury.
Thick bar training automatically trains your hands, fingers and forearms at all angles. If you are bench pressing, the thick bar will train your hands and forearms in a completely different way than if you are doing chin ups with a thick pull-up bar.
Thick bars are harder to handle so you need to concentrate a lot harder. Some credit this alone with making them significantly stronger.