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Bit of a stream of concious thread here.
Why are so many people looking to knock 5mins or 15mins or any round number of minutes off their PBs? Even 30sec/min or any other random figure that's seemingly plucked from thin air.
Surely it is better to look at %age improvement rather than an absoulte.
Say for a 10:00/mile runner that gives a 10k/half time of 62:30/131:00. The next thing you see is help me get under an hour or under 2hours. It's an admirable target but what does it mean in real terms of training and effort?
For a 10:00/mile runner to get down to an hour that's 0:20/min off their pace. That's a 3.3% improvement. For an 8:00/mile to drop their pace by 20secs that's 4.1%. Doesn't sound a lot does it. It feels a lot!
They were just musings I was having this afternoon when out running and trying to 'feel' the differences in various paces between 8:00/mile and 10:00/mile and the amount of extra effort I had to put in each time I stepped up 20secs a mile.