Taller Ninja
Train like a ninja.
Grow into your potential.
The honest habit app for teens: posture, exercise, food and sleep during puberty. Daily training, streaks and belts — from white to black.
Your daily training
Posture & stretching
Guided exercises with built-in timers: wall posture, chin tucks, bar hangs and more. Standing tall is height you already own.
Eat like you mean it
Meal ideas and the nutrients behind them — protein, calcium, vitamin D. No calorie counting, ever.
Sleep is training too
Growth hormone is released in deep sleep. Fixed bedtimes, 8–10 hours, and a sleep posture setup.
Track your growth
Log your height monthly and see it against the estimate doctors use — the mid-parental method, honestly explained.
And it keeps you coming back
Ask the Ninja Coach
An AI coach for quick questions about posture, sleep, food or movement. Kept strictly on topic: no medical advice, no supplements, and never a promise in centimetres.
A 30-day program
Every day a short guided training that builds on the last, showing each pose before its clock starts. Finish the thirty and it starts again, a little harder.
Your week, every Sunday
A recap of the seven days: how much of your potential you used, your trainings, your belt and your latest measurement. Reminders that open exactly what they promise.
Yours, and portable
Everything lives on your phone. An optional account backs up your progress so a new phone picks up where you left off. In English and Dutch.
Earn your black belt
Every training day earns XP. Keep your streak alive, unlock badges and climb the belt ladder.
Why Taller Ninja is honest
- No miracle claims — we tell you what works and what does not.
- We never sell supplements or "growth" products.
- Our height estimate uses the same method pediatricians use.
- Your data stays on your device. No tracking, no ads.
- The AI coach gives habit advice, never medical advice — and never promises centimetres.
Genetics set your range — sleep, food and movement decide whether you reach the top of it. Taller Ninja is not medical advice. Talk to a doctor if you have questions about your growth.