Exercise trackers comprised of software, display screens, sensors and monitors for displaying, measuring, monitoring, recording, storing and uploading to the internet information relating to health and fitness including time, date, heart rate, heart rate variability, activity level; respiration, ventilation, body-fat, calories burned, blood pressure, blood temperature, blood oxygen levels, temperature, vital signs, body temperature and the declination of body and heart rates; wearable digital electronic and wireless devices comprised of software, display screens, sensors and monitors for displaying, measuring, monitoring, recording, storing and uploading to the internet information relating to health and fitness including time, date, heart rate, heart rate variability, activity level; respiration, ventilation, body-fat, calories burned, blood pressure, blood temperature, blood oxygen levels, temperature, vital signs, body temperature and the declination of body and heart rates; pedometers in the nature of step counters; scales; weighting scales; body weight scales; body weight scales with body fat analyzer; bathroom scales; kitchen scales