How can I get the Venu 2 to auto-detect whether I'm walking or running within a given workout? For example, if I start a walk activity, and I break into a jog for certain sections of it, I want the device to detect that I'm jogging. I've read something about a run/walk feature that some Garmin devices have but I cannot find it on my Venu 2. I also know that there is an auto-detect feature but I can't find information about how this interacts with an activity that you have manually started.