FIELD NOTES

Better questions after the calculation

Clear, research-led explanations for the gaps between a formula and real life.

BMI Is a Screening Tool, Not a Verdict

Why a useful population measure can still miss muscle, body composition and individual context.

A calorie estimate is a starting hypothesis. Your trend data tells you how well it fits real life.

Body weight is one clue. Weather, food, exercise and individual sweat losses change the picture.

Formula-based zones are population estimates. Heat, fatigue, devices and your actual maximum can shift the reading.

A recent race gives the model a useful anchor, but it cannot see endurance preparation, fueling or race-day conditions.

The familiar 90-minute rule is an average. Real cycles vary within one night and between people.