Get early access to The Perfect Health Lesson, and the calculator discussed in today's lesson. Click this link now In today's episode: More than seven million individuals all over the world have tried our Health Calculator. American health authorities recommend our calculator over other non-exercise models to estimate how healthy you really are. In 2007 and 2008, several thousand Norwegians tested their CRF Score on a treadmill in The HUNT Fitness Study. They also answered several questions and had a complete health check-up as part of the third HUNT study (HUNT3). Therefore, we could establish the most important factors for health among healthy women and men. These factors – namely age, waist circumference or body mass index (BMI), leisure-time physical activity and resting heart rate – are those included in the algorithm that constitutes our Health Calculator.