YOU like listening to music while you work out, but you don't like snagging your personal music player's cord with your arms, nor do you like ruining your earphones by getting them all sweated up. Yep, we know how it is. One solution could be to use a pair of JF3 Freedom Bluetooth Buds, that wirelessly receive music from your mobile phone, and are moisture-resistant. You could also get yourself a similar device made by a little Japanese company called Sony, however, as of next month. That's when the latest version of the W Series Walkman MP3 player for sports enthusiasts will be hitting the stores, in a smaller, lighter format. Officially known as the NWZ-W260 model, the new W series consists of just two linked earphones, one of which has a built-in MP3 player. Unlike the JF3s, no other device is required. As compared to its W series predecessors, this particular model is reportedly 24 percent lighter, and one third the size. GM a