Sony's new mp3 player the S2 Sports Walkman coming out in mid September is fully stocked with tools to aid your work out - it counts your calorie burning, acts as a pedometer, and a stopwatch to time your trip. It also allows you to set music playlists for different paces of workout, and then it intelligently selects which songs to play by how hard you're working out. The last function leaves me confused - if you shake the player three times, it will turn on or off; how does running exactly effect this?
