Powerhouse Gym 24385 Halsted Rd, Farmington Hills, MI48335 The Powerhouse Gym, located on Halsted Road in Farmington Hills, has been helping people stay fit and healthy since…More 1975. The Powerhouse Gym offers classes in martial arts for adults and children, taught by world-renowned body builders and UFC fighters. It also offers student scholarships for track and martial arts. Owner Tim Mumford knows the importance of giving back to the community. He routinely organizes clothing drives, parades and other community service events to benefit the people of Farmington Hills.