G20 Pro Upgrade Kit G20 Pro Upgrade Kit Product form $599.00 Free pickup in our locations Add to cart DESCRIPTION WHAT'S INCLUDED WARRANTY DESCRIPTION Level up your Force USA G20 Pro All-In-One Trainer with the exclusive G20 Upgrade Kit that includes jammer arms, dip bars, and a leg developer attachment. WHAT'S INCLUDED Jammer Arms (Pair) Leg Extension / Leg Curl Attachment Dip Bars WARRANTY Lifetime Structural Warranty