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How about we exclude:
1) Anyone between the ages of 45-55 ( on the basis that they are having a mid life crisis)
2) Anyone overweight
3) Anyone who is predicted to finish above 12hrs (24hrs for DIM and so on)
4) Anyone who is rich and can afford bling bikes and coaching
5) Anyone with an ego and only wants to finish to brag
Only my opinion of course .......