A treadmill for a tall person should be at least 60 inches (152 cm) long on the running belt. It should also be a minimum of 20 inches (50 cm) wide. That length and width will allow most taller people to get a natural running stride with any movement constriction. People who are more than 5’5'' (1.65 m) will need a running belt that is at least 65 inches (165 cm) long and 22 inches (55 cm) wide.