Show exerine and age amounts of phi steal activity re quiren by healthy persons at different ages as computed by various authorities are summarized in an article on exercise in by dr james 0 nail the program quoted calls for four hours dally at the age of five five hours dally from seven to nine years six hours dally from nine to eleven years five gnara dally from eleven to thirteen years tour hours dally from to years three hours dally from sixteen to eighteen years two hours dally from eighteen to twenty years and one hour dally tor persons over twenty years of age |