Grip4Force Grip Trainer Pull-Up Bar Attachment

Thick rubber pull-up bar attachment, 2.25-inch grip diameter. $30-40. Best for pull-up-centric grip training. Similar function to Fat Gripz but specific to pull-up bars. For athletes whose primary compound is pull-ups, not barbells.

Grip4Force is a thick rubber attachment built specifically for pull-up bars, expanding the bar diameter to roughly 2.25 inches and forcing the open-hand grip patterns that climbers and pull-up athletes actually use. It functions similarly to Fat Gripz but is shaped for pull-up bars rather than universal application — the attachment seats cleanly on a standard horizontal bar and stays put through dynamic movements. For lifters whose primary grip-training vehicle is the pull-up bar rather than barbells, Grip4Force is more focused than Fat Gripz; for lifters who train across barbells and dumbbells, Fat Gripz is more versatile. The choice between them is application-specific.