Abstract: A barbell collar is described having a moveable piston disk, one or more energizers, and a body collar. Further, the barbell collar includes one or more dynamic, removable contact patches. In one embodiment, two of the contact patches are dynamic and can move in and out towards a barbell. The contact patches are configured to move inward towards a barbell or away from a barbell responsive to an action applied to adjustable fastener elements that can be hand tightened and adjusted from the outside of the barbell collar. The barbell collar is configured to prevent movement of weight plates from falling off of the ends of the barbell, and the barbell collar includes energizers (e.g., springs) that can absorb movement from the weight plates while loaded on the barbell.