|For the unmarked Madden's gym in North End, see Boxing gym.|
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.
- If defeated, Mad Mack will speak to the Champ, encouraging them that it is OK and they will be back in fighting shape in no time.
Madden's gym appears only in Fallout 4.