For a female, something on the order of 5'3", 97 pounds. For a male, slightly larger - perhaps 5'8", 130 pounds. -- According to IAAF records: The top 5 fastest female marathoners of all time: average 5'3" and 104 lbs. While the 5 most recent men's world records were set by athletes averaging: 5'6" and 127 lbs.
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