Portable Treadmills - For People On The RunPortable Treadmills are a convenience most appreciated by busy people.Manufacturers like Walkmill focus on light folding machines that will set up and fold away quickly.They are suitable for a quick workout, perhaps in an office, and some hotels are offering rooms with such portable sports equipment for travelers away from their clubs or home gyms who want to unwind or continue their health and fitness regimens but do not want to go down to the hotel fi.