http://www.heartratewatchcompany.com/ultra-running-s/163.htm Ultra running has special equipment demands that require good battery life and accurate pace, distance, speed and heart rate. Today;s GPS technology provides those tools along with several accelerometer based systems. We highlight the best of the best from our many days of testing.
this video is awful. doesn't give any info past what one would find on their amazon page. waste of time.
artofultrarunning 2 weeks ago