The Polar RS 300 X is among the the best heart rate monitors that you may find in the marketplace today. It not merely monitors your heart rate, however it has unmatched timing features in a sporty watch style. The timing features make it an ideal monitor for tracking not only running progress but it is also designed for a variety of other sports activities. The Spherical RS 300 X monitor allows you to choose a sport and individualize the zone to fulfill your particular needs. This heart rate mo
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