The nickname is used for rankings in Step Challenges.
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Body Mass Index
The Body Mass Index (BMI) is a value that allows the classification into underweight (BMI < 18.5), normal weight (18.5 ≤ BMI < 25), overweight (25 ≤ BMI < 30) and obesity (BMI ≥ 30). BMI is based only on body weight and does not take into account body composition such as muscle mass. For people with a large muscle mass or water retention, the BMI is not very meaningful.