Treadmill Exercise Equipment Manual Folding Treadmill - This treadmill equipment has been designed and constructed to provide trouble free usage and enjoyable exercise. Folding treadmill works by harnessing a combination of gravity, and your walking action. In contrast to other types of manual treadmill, you will find this treadmill exercise equipment easier to start with the treadmill on the steepest incline. Ensure the treadmill exercise machine is on a flat, level surface. Set the incline to the steepest position using the incline adjustment pins. Once you reach the point of using the highest resistance level, simply reduce the incline level, which will make the running surface flatter, and reduce the amount of gravity - therefore making it more difficult to drive the mat with your feet.