How do they measure reach? Even Haye is down as 81 inches which makes his arm nearly 7 feet long?! I wear long sleeved shirts, but if I measure my 'wingspan' it is 78 inches.
Think it depends on the particular Boxing Association/country in question,some quote reach other's arm length...
Reach is measured fingertip to fingertip, i,e wingspan.
Arm length is measured from armpit to Knuckle tip of the lead arm(jabbing hand)
Arm length is more accurate/important than reach because two boxers with the same reach may have different arm length due to shoulder breadth.
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