Anyone doing serious training should check out DC Rainmaker's take: http://www.dcrainmaker.com/2016/05/initial-thoughts-on-pebbles-new-optical-hr-time-2-and-3g-

Anyone doing serious training should check out DC Rainmaker's take: http://www.dcrainmaker.com/2016/05/initial-thoughts-on-pebbles-new-optical-hr-time-2-and-3g-gps-connected-core.html http://www.dcrainmaker.com/2016/05/initial-thoughts-on-pebbl...