Sources & Methodology
How EvolveFit365 calculates your scores, the published guidance we use, and your medical disclaimer — all in one place.
The Optimality Score and Body Age are EvolveFit365's own scoring model, developed from over twenty years of professional personal training experience. They are not clinical or diagnostic measures, are not recognised medical assessments, and are calculated from data you record yourself. Body Age is a comparative indicator derived from self-recorded measurements, not a medical assessment of biological age.
BMI healthy range 18.5–24.9
NHS BMI guidance and WHO BMI classification
Informs the BMI bands and the Body pillar.
Body fat estimation
Deurenberg, Weststrate and Seidell, British Journal of Nutrition, 1991
Informs the equation estimating body fat from BMI, age and sex.
Body fat categories
American Council on Exercise body composition categories
Informs the athletic, optimal, average and above healthy range bands.
Lean body mass estimation
Boer, American Journal of Physiology, 1984
Informs the lean body mass equations.
Blood pressure ranges
NICE Guideline NG136, Hypertension in adults
Informs the blood pressure bands and the urgent advice threshold.
Resting heart rate
NHS and British Heart Foundation
Informs the normal resting heart rate range.
Weekly activity targets
UK Chief Medical Officers' Physical Activity Guidelines 2019 and WHO Guidelines on Physical Activity and Sedentary Behaviour 2020
Informs weekly activity recommendations.
Sleep duration
NHS sleep guidance, and the American Academy of Sleep Medicine and Sleep Research Society consensus 2015
Informs recommended sleep duration.
Hydration
European Food Safety Authority Dietary Reference Values for Water, and NHS hydration guidance
Informs hydration targets.
Energy requirements
Mifflin-St Jeor equation, 1990
Informs the personalised calorie target in nutrition plans.
The following are EvolveFit365's own model based on professional coaching experience, not derived from published clinical standards: the Optimality Score and its pillar weightings; Body Age including the neutral score, weightings and limits; the lean mass percentage bands; the athleticism performance ranges; the adherence score bands; and the way scores reduce outside an optimal range.
EvolveFit365 is not a medical device, does not diagnose, treat or prevent any condition, and does not provide medical advice. Users should consult a qualified healthcare professional before starting any new exercise or nutrition programme, particularly if they have an existing health condition, are pregnant, or taking medication.