With a six - day long battery life, a heart rate monitor and fitness age feature, this is a device created more for gym - goers than runners. (techradar.com)
Website shows if you're old beyond your years — by calculating fitness age Dating Calculator: To find the percent of Carbon 14 remaining after a given number of years, type in the number of years and click on Calculate. (myintimcity.com)
Website shows if you're old beyond your years — by calculating fitness age Date Calculator. (myintimcity.com)