In 1985, Nebraska strength and conditioning coach Boyd Epley derived the
formula: 1RM = weight(1+(reps/30)), assuming r > 1. Ever since then, this
equation has been used to find percentages of maximum exercise capacity
to use in working sets. These numbers will give you a pretty good idea of
relative loads, but may differ in accuracy or precision based on the age,
gender, and experience of the athlete and the technical rigor of the excerise.
Your BMI is a measurement of your body weight based on
your height and weight. Although your BMI does not actually "measure" your
percentage of body fat, it is a useful tool to estimate a healthy body weight
based on your height. Due to its ease of measurement and calculation, it is
the most widely used diagnostic indicator to identify a person's optimal weight
depending on his height. Your BMI "number" will inform you if you are underweight,
of normal weight, overweight, or obese. However, due to the wide variety of body types,
the distribution of muscle and bone mass, etc., it is not appropriate to use this as the
only or final indication for diagnosis.