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Downloadable computer programs and downloadable computer software which synchronize individual user data obtained from body weight scales, body fat monitors, and body fat analyzers with electronic devices used for exercise monitoring, for use in managing and analyzing personal data for health care, managing and analyzing personal data such as body weight, body composition, the number of steps taken by the user, and blood pressure, for providing advice for health care based on synchronized individual user data, and for providing advice for health care based on individual user data such as body weight, body composition, the number of steps taken by the user and blood pressure; computer programs and computer software recorded on electronic circuits, IC cards, magnetic tapes, magnetic discs, optical discs, magnetic optical discs, CD-ROMs or DVDs which synchronize individual user data obtained from body weight scales, body fat monitors, and body fat analyzers with electronic devices used for exercise monitoring, for use in managing and analyzing personal data for health care, for managing and analyzing personal data such as body weight, body composition, blood pressure, and the number of steps taken by user, for providing advice for health care based on synchronized personal data, and for providing advice for health care based on individual user data such as body weight, body composition, blood pressure, and the number of steps taken by user