Focused Muscle Engagement, Explosive Results The Force USA® Jammer Arms turn your All-In-One Trainer into a power-building machine that hits harder than anything you’ve tried before. Engineered to fit 2" × 2" uprights on every G and C-Series, these attachments deliver the kind of chest, shoulder, arm, and back work that takes your training up a level. Compact and efficient by design, they’re the opposite of the bulky, awkward Jammer Arms you’ll find elsewhere. Quick to attach and effortless to adjust, they flow with your session instead of slowing it down—so you can stay locked in and keep lifting heavy. With multiple grip positions and a durable black powder-coated finish, Jammer Arms are built for endless presses, pulls, and power moves. Smooth, strong, and designed by engineers who train, they’re the upper-body upgrade your gym has been waiting for.