Since you do not have to touch the console to adjust the speed, you can do this while staying in motion. The hydra-suspension system of the 9.35HR has adjustable cushioning. This design allows you to choose from twelve different levels of cushioning on your feet, so that you can change it to adapt to the style of run you are taking on. The 9.35HR also has a music system that allows you to plug in your MP3 player, so that you can have your music playing out loud. The 9.35HR has essentially the same specs as the higher cost 9.45ST treadmill, but without the ultra-quiet whisper weave treadbelt or lifetime parts warranty. The Smooth Fitness 9.35HR fitness treadmill comes with a seven year parts warranty and two year labor warranty. The frame and motor both have lifetime warranties.