A two-roomed building, this gym is located to the left upon entering the galleria. Inside, one can find a boxing ring on the left, and a counter manned by Danny is to the right, along with a shelf containing some Buffout, stimpaks, and Jet. A door behind the counter leads to the office, where Madden's office terminal and an open safe can be found.
- Stepping into the ring after the grand reopening will initiate a proper boxing match with the Champ, although stepping out of the ring during the fight or using any weapon other than the boxing gloves, will turn the other robots hostile. If the Champ is defeated using only the boxing gloves, the Sole Survivor is declared the new champion, and the other robots will go back to their daily lives.
- After defeating the Champ, Mack will hover over it and start to speak to the remains in an encouraging way, telling the Champ that it is OK and they will be back in fighting shape in no time.
Madden's gym appears only in Fallout 4.