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I keep hearing about 'good for age' times and as I didnt understand what it was about I did some googleing. There are some race specific GFA times (VLM, Edinburgh, Boston etc) but these are based on age and time. I have seen an iPhone app called Score My run that also includes the hilliness of the run.
I was wondering what people's views are on using a GFA calculator ? Is this information giving me anything I dont already know ? (apart from if my run was good for age or not). Is it worth getting this app or should I just use my times to rate my own performance ?