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A previous thread on this board discussed the perceived relatively larger physiques of female 800m runners compared to their male counterparts.
Notice much bigger the male 800m runners were then the male 1500m runners ~18 pounds a man! At 160 pounds a piece the male 800m runners are large--compared to distance runners.
Also interesting is that the 1500m and 5000m runners were roughly the same height, but the 5000m runners were about 4 pounds leaner.
The 10,000m guys are rail thin.