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Free forever
Up to 10 students
Core library, branding and stock photos. No credit card.
Start free
7 starter templates
A knowledge home for fitness schools.
Programming, terminology and the why beneath the work.
→ Explore the features
Free for up to 10 students
Data stored in London
Works offline
A fitness school stands or falls on the quality of its programming and the trust between coach and student. Whether you run Pilates classes, calisthenics, strength and conditioning, CrossFit, HIIT, or mobility work, students need to understand the why beneath the work as well as the what.
C3NTR gives your members a quiet place to read. Articles on each movement and progression, terminology glossaries, mobility and recovery work, programming notes, and the principles that hold your method together. Coaches stay aligned; members come to class informed.
Find your method below, or browse all seven fitness disciplines we have starter templates for.
7 fitness disciplines
Each discipline has a starter template you can import in a few taps. Pick yours below.
Boxing Fitness
Levels, beginner, intermediate, advanced
See boxing fitness →Calisthenics
Levels, beginner, intermediate, advanced
See calisthenics →CrossFit
Scaled, intermediate, RX (or your box's progression)
See crossfit →HIIT
Levels, beginner, intermediate, advanced
See hiit →Mobility & Flexibility
Levels, beginner, intermediate, advanced
See mobility & flexibility →Pilates
Levels, beginner, intermediate, advanced, teacher training
See pilates →Strength & Conditioning
Levels, novice, intermediate, advanced, competitive
See strength & conditioning →Built for teachers, not for IT
C3NTR is meant to feel like writing in a notebook, not configuring software. No training course, no setup project.
Write directly in the app
Like a notepad. New articles are drafts until you publish, so nothing goes live by mistake.
Mobile-first authoring
Edit on the phone between classes or on the way home. The same library, the same edit screen.
A working library in under an hour
Import the starter template in a few taps. Edit anything that doesn't fit. Publish when ready.
What C3NTR is, and what it isn't
A library your school owns
Another booking or billing system
Built for how schools actually teach
A generic course builder
Calm, focused reading for students
A feed competing for attention
Privacy
Private to your school. Stored in London.
Your school's knowledge stays with your school. This is how C3NTR looks after it.
Stored in London
Your school's data is stored in London, on Google Cloud.
Private to your school
Content reaches only your school's own members. There is no chat or open messaging between members, and no public profiles.
No ads in the app
The app has no ads, no advertising ID, and no analytics or attribution tools built in.
Report or hide anything
Every item in the app can be reported or hidden, with Report or block.
Start free. Move up when you outgrow it.
School
£39/mo
or £384/yr — two months free
Up to 100 students
Video and audio. Push notifications. Advanced analytics. 5 GB media storage.
Choose SchoolAcademy
£69/mo
or £684/yr — two months free
Unlimited students
Multi-instructor publishing. Priority support. 10 GB media storage.
Choose AcademyDon't see your fitness discipline?
Tell us what you teach and we'll add a starter template. In the meantime, the app already works for any structured curriculum. Your library starts blank in a few minutes.
Ready to give your fitness students a knowledge home?
Free for the first 10 students. No credit card. A working library in under an hour.
Start free for your school