The Fitness Mad Universal training bar can be attached to most doorframes with openings between 70cm (27.5") and 78cm (30cm) and depths between 11cm (4.3") and 16cm (6.2"). It is ideal for doing multi-position Pull Ups, Chin Ups and suspended crunches. This multifunctional training aid can be placed at the bottom of the door frame to serve as a sit-up bar or it can be put on the floor to become a multi-position push-up bar.