Thanks very much for all your replies. I am running approx 8.15 per mile over 10-14 miles at the moment, so with max HR at 183 I'm probably running at about 80% of my anaerobic threshold.
When I increase my distances I suspect I'll bring the speed down to nearer 9 min miles and therefore a HR of nearer 130 which is 70% AT.
Great help this website, all new to me so thanks very much!
Just wonderd if my average heart of 150bpm over a half marathon distance is within the norm. I'm a 37 year old man in training for my first marathon.
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