A male’s capacity for exercise drops 10% for every 10 years of age after the age of 20. A female’s capacity to exercise drops 2% for every 10 years of age after 20. (Stump, Jane Barr, PhD. What’s the Difference? p 17, 93. NY:William Morrow and Company, Inc., 1985.)

At 55 a man has only 70% of the capacity to exercise that he had at 25. A 55 year-old-woman’s capacity for exercise is reduced by only 10% of her capacity at age 25. (Stump, Jane Barr, PhD. What’s the Difference? p 76. NY:William Morrow and Company, Inc., 1985.)

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