If that is not an option, arrange your electrical options to include a hefty overhead fan. Make sure electrical outlets are placed where you intend to place equipment such as treadmills, or any other piece of equipment needing juice. But because many new homebuilders forego garage windows, make sure the ventilation is adequate here as well, without having to open your garage door to achieve it. Floor surfaces should be able to take lots of wear and tear. Some home gym enthusiasts vary the floor surface, space permitting, with a hardwood or vinyl area for aerobic workouts, and a carpeted area for floor exercising.
Builders often offer mirrored walls as options for dining room and formal areas.
Putting a mirrored wall in your home gym will give you the added advantage of observing and correcting your form, important to many exercise gurus. If you enjoy jogging around the neighborhood, you may opt for strength training equipment only in your gym. Make sure the equipment fits into the room with room to spare for leg and arm extensions. There is nothing much more frustrating than literally hitting a wall each time you do an exercise. If your gym is to be located in an upper floor of your home, check to make sure you can fit the equipment up stairwells and around corners.