ENHANCED NEURAL DRIVE: Thicker grips stimulate more muscle fibers in your hands, fingers, and forearms. As you contract a muscle while holding a thick bar, you are not only contracting the primary muscles in the hands and forearms, but you are also stimulating the surrounding muscles and connective tissues. Furthermore, it takes a lot more focus when training with thick grip because they are harder to handle, which will make the contractions even greater. INCREASE STRENGTH AND MUSCLE MASS GAINS: The more muscles you contract using thicker grips the stronger your grip will become. Not only that your overall strength and muscle mass will increase. Thicker grips also improve imbalances and reduces injuries by taking the stress off the joints and placing it on the muscles. The thicker the bar the more the weight will be distributed evenly in the hand.