Nike and Polar have teamed up to introduce the new Polar WearLink wireless heart rate monitor. Made to work with the Nike+iPod system, the WearLink is worn around the user’s chest and wirelessly transmits heart rate data to the Nike+iPod Sport Kit, or to the Nike+ Sportband. Users can then hear spoken feedback of their beats per minute (BPM) during a Nike+iPod workout; this data can also be transferred to the nikeplus.com website. In addition,…