This building is found on the street corner, opposite the boarded-up front entrance of the Old North Church. There is a sign above that says Madden's and the entrance is a light green door. There is a single boxing ring in the center of the room and a weight lifting area off to the right side. In the back is the manager's office, which contains an Advanced locked safe. Several doses of Buffout are scattered across the gym.
- 160 lead in the form of various weights, dumbbells, and barbells lying around.
- At least seven bottles of Buffout scattered around the gym.
In the corner next to an ice chest, a toy alien can be found "lifting" a 160 pound dumbbell. There is a bottle of Buffout sitting next to him.
The boxing gym appears only in Fallout 4.
- Fallout 4 Vault Dweller's Survival Guide Collector's Edition p. 469: "[13.12] BOXING GYM
You're probably not getting enough exercise, so use this place to scavenge for ammo and chems. There's a footlocker (Novice) and safe (Advanced) to unlock, and the smell of sweat still lingers."
(Fallout 4 Vault Dweller's Survival Guide Map)