Harbinger Big Grip Thick Bar Grips | PairGrip strength is usually an athlete's first indication of fatigue when training . Harbinger's BIG GRIP bar grips will help you train your muscular endurance in a way that will improve functional grip strength. Our BIG GRIPS convert barbells, pull up bars & cable attachments into "thick bars". Thick bar training activates more muscles when lifting, and builds bigger, stronger arms and upper body faster. Weightlifting and bodybuilding pros have used