Madden's Boxing Gym is a venue in the General Atomics galleria in the Commonwealth.
If someone wants to learn boxing, this is the perfect place. The Champ teaches, Mack oversees and Danny sells supplements to keep budding athletes in shape.
This small building contains a main storefront that includes a boxing ring and some lockers, as well as a front desk where one may buy performance enhancing supplements (namely Buffout and Psycho). There is also a back office behind an Advanced lock that contains a terminal that grants a discount for managers.
Madden's Boxing Gym appears only in Fallout 4.