Hello - apologies if this should be in the beginner forum.
I really started running on 1st January 2014, with the initial goal of a sub 20 5km, although now I have the running bug. When I started I couldn't run 2km without dying, and now I am running 12km in 53 minutes and at 20 miles per week. I am now aiming to run the Sydney City to Surf in sub 60 minutes (14km, in 5 months time).
My question is around my aerobic base. When I start running with my Garmin 405CX w/HR monitor, my heart rate within 30 seconds is ~155bpm. I understand that *my* aerobic training is zone is 145bpm. I really struggle to keep at 145bpm, often spiking to 151bpm/160bpm. Should I stop and walk to ensure that I get back into the zone? I am looking at continuing my aerobic base training for another 10 weeks, hopefully running for 5-7 hours per weeks in my aerobic training zone.
My current aerobic base speed is 10:30 miles, which I am also assuming will come down as my technique and aerobic base improves. I have had running lessons this year, and I do struggle to run with the form that I have been taught and stick