The length of treadmill belts varies depending on whether the model is intended for walkers, joggers, or runners. Walkers choose a shorter belt length, whereas runners like to lengthen out their stride. ProForm decks are available in sizes ranging from 55 to 62 inches, making them suitable for all athletes. The size of the belt is one of the most important decisions you'll make when buying a home treadmill. Understanding how long a belt should be will help you select the right size for your needs and your budget. Belt length is measured from the center point where it attaches to the motor shaft to the end where it loops over the roller at the back of the machine. So, if you need more distance between those two points, get a longer belt. If you want to go faster, use a shorter belt. The recommended minimum belt length for running is 56 inches, but many experts recommend at least 60 inches for best results. The ideal treadmill belt length allows for a comfortable stride while keeping the user ahead of the belt. Too short a belt will cause the feet to strike the ground before the treadmill has moved enough for another step. This can be uncomfortable and possibly lead to injury. A belt that is too long may cause the user to take longer steps than normal, which could lead to ankle strain or other injuries.