Fitness&me Blog

Evidence-based guides on AI body fat estimation, body fat percentage charts, calorie deficit calculators, protein targets, and sustainable weight loss. Every guide is written by the team behind the Fitness&me AI workout planner, calorie tracker and body-fat scanner.

Coach Voices

• Why most men over 40 never get lean — in 16 slides — The hidden calories you never sat down for, why the weekend cancels the week, and the skill of being slightly hungry without treating it as an emergency. (6 min read)

Programming

• DUP-3: Why I Train the Same Muscle at Three Different Rep Ranges Each Week — Rhea 2002: same exercises, same total volume, half the time — DUP gained 2x more strength than linear periodization. The 3-rotation version, in plain words. (8 min read)
• APRE 10: The Quiet Algorithm That Picks Your Working Weight For You — Mann's D-1 football protocol in 4 sets. Why the algorithm out-progresses linear programs by ~2x on bench and squat — and how to run it without thinking. (7 min read)

Muscle Building

• Best Exercises for Biceps Peak (And the Honest Truth About Genetics) — Why biceps peak is 70% genetics and 30% training — and the exact 30% you can change with long-head-biased curls. (7 min read)

Nutrition

• The 60-Second Scan: How to Read a Restaurant Menu for Calories — Why "grilled chicken salad" can be 1,100 calories, and how 6 menu keywords tell you everything about calorie density in under a minute. (6 min read)
• How Much Protein You Should Eat Every Day to Build Muscle (Real Numbers, Not Bro-Science) — 1.6-2.2g per kg of bodyweight — backed by a 2018 meta-analysis of 49 studies. Why higher is just expensive pee, and how to hit the target with real food. (6 min read)
• Calorie Deficit Calculator Guide: How to Lose Weight Without Losing Muscle — TDEE → deficit → protein target → 7-day moving average. The full formula for losing 1 pound per week sustainably, without the rebound. (7 min read)

Reference

• What is a good body fat percentage for each age group? (Charts for Men and Women) — A 25-year-old at 18% body fat reads differently than a 55-year-old at 18%. The age-adjusted charts, plus when "lean" becomes unhealthy. (6 min read)
• Body Fat Percentage Chart for Men and Women (With Visual Descriptions) — What 10%, 15%, 20%, 25% body fat actually looks like — with realistic target ranges for men and women based on ACE and ACSM data. (5 min read)

AI & Body Composition

• How to Take Progress Pictures for Accurate AI Body Fat Analysis — Why your photo conditions move AI body-fat readings by 4-6%, and the exact 7-point setup that makes weekly trend tracking trustworthy. (6 min read)
• How AI Estimates Body Fat Percentage from a Photo (And How Accurate It Really Is) — How AI reads your silhouette, shadows, and muscle definition to estimate body fat — and the two physics problems that fight the model. (6 min read)

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