The Preacher Curl attachment is an additional muscle isolation tool for use with either the SCS or FIDB benches. The Preacher Curl attachment allows the user to isolate the biceps for specified muscle building using an EZ bar or straight bar which cradles within the lower holster. The elbows and triceps are placed atop the cushioning area underneath the chest. This takes the supporting muscles of the core out of the contraction isolating the biceps and allowing for specified muscle growth within the area.