Fit By Sci(ence)
The SHAPE Protocol™
Free Tool

Be biologically younger than the man on your driver's license.

Free. 30 seconds. No email required to see your number.

Built for men over 35 who feel like their metabolism quit on them.

I went from a metabolic age of 90 at 40 to 18 at 42. Same calculator. Same math. The arc is reachable.

Step 1 of 2

Pick Your Path

Three ways to get your number. Pick what you can give us right now.

Method:—
Your Result
Method
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Metabolic Age
Biological
0
Metabolic
0
Gap
0
BMR
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cal/day at rest
TDEE
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cal/day total
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Free. No application. The room of former-athlete dads doing this with you.

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Why This Matters

It's not your age. And it's not a broken metabolism.

Half the internet says your metabolism falls off a cliff after 40. The other half says that's an excuse, that the research shows it barely moves until your 60s.

They're both missing it.

Every metabolic age calculator does the same math. The Mifflin-St Jeor equation. Then it hands you a number and walks away. Some sell you ads. Some sell you a supplement.

Your metabolism didn't break. Your engine got smaller. Aging is the timeline. Muscle loss from disuse is the cause.

And here's the part nobody says out loud. You're probably still eating like the athlete you used to be. The problem was never that you eat too much. It's that the engine that burned it, the practices, the training, the all-day movement, is gone. Same fuel. Smaller engine.

Lean mass drops 3-5% per decade after 30. Unless you train it.

The man who does hits 60 with the BMR of a 35-year-old.

The man who doesn't hits 42 with the BMR of a 65-year-old.

Same age. Different math. Different mirror.

You didn't get older. You got smaller. Reversing it is not about cardio, not about eating less, not about willpower. It is about rebuilding the engine in the right order.

That's the conversation worth having. Book a 30-minute audit above and we'll walk through what's actually behind your number and what would move it.