Try to put your treadmill in an open space with ample ceiling height. Some options include the basement, spare bedroom, or office. For comfort and safety, allot 6 feet (1.83 m) of space behind the machine and 2 feet (0.61 m) on both sides. The front of the treadmill will also need 2 feet of space for ventilation. What's more, an 8-feet (2.44 m) ceiling should give enough clearance for most treadmills.