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This building is found opposite the boarded up front entrance of Old North Church. There is a sign above that says Madden's and the entrance is a light green door. It is made up of one large room. There is a boxing ring in the middle of the room. On the left hand side is what used to be an office with a safe inside. Over on the right hand side is a weightlifting space, complete with various weights.
- 160 lead in the form of various weights, dumbbells, and barbells lying around.
- At least 7 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.