This disclosure describes an apparatus and methods to support a punching bag, or a punching bag and rebound platform, within a doorway or other architectural opening. Mounting the apparatus does not involve modifying or altering the supporting architectural structures and surfaces (e.g., with screws, brackets, adhesives, etc.). Clamps are instrumental in safely securing the apparatus and stabilizing it for high-performance use of a plurality of punching bags. Adjustment mechanisms not only facilitate the mounting of the apparatus to a plurality of doorframes and other architraves but also accommodate the height and depth preferences of a user. In addition, a folding mechanism allows the apparatus to be compacted for storage or transport.