Because the Gold's Gym CrossWalk 570 treadmill comes equipped with the upper body arms, you can burn up to 50% more calories using the Crosswalk 570 over other treadmills. Work your whole body as you reach all your fitness goals. I iPod-compatible music port will help you stay motivated with your favorite tunes while you’re doing it! Just plug in your iPod and go! You can also plug in your MP3 player into the console. The sound system can handle both with ease. The CrossWalk 570 has a big 20 x 55 tread belt that gives you all the room you need to reach the finish line. The lifetime frame warranty gives you the confidence to make the commitment to do it.