XMark Captain’s Chair with Dip Stand and Push Up Station, Commercial Vertical Knee Raise, Upper Body Workout Machine $279.00 Make sure this fits by entering your model number. Define your abs, develop your chest muscles, and increase your strength in your arms and back using this one multi-functional workout station. Upgraded to include commercial back and arm support cushions, you’ll immediately notice the denser cushions and the high-density, double red-stitched, sweat and tear resistant vinyl.