Independent gyms
One coach, an assistant or two, and a steady weekly schedule. C3NTR puts your programming, technique and recovery notes in one place. No second tool, no spreadsheet.
For fitness schools
A knowledge home for your calisthenics gym.
Bodyweight progressions, mobility and the long road of strength
→ See a quick tour
Free for up to 30 students
No credit card
UK GDPR · EU (London)
Works offline
Your gym's programming deserves a home
Progressions from push-up to handstand get demonstrated but rarely written. Mobility prerequisites blur between sessions. Conditioning plans live in the coach's head. C3NTR is a quiet place to write it all down once, in your gym's voice.
Who this is for
Gyms with multiple coachs
Two or more coachs, several classes a week. C3NTR holds the shared standard so every session draws from the same library.
Outdoor calisthenics communities
You train in the park. Content locked by level keeps newer members on basics while advanced see static skill prep.
Built for teachers, not for IT
Your coach opens the app, taps Edit, and writes the next progression breakdown in plain prose. The next session, members know the cue before they attempt the skill.
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.
Levels, beginner, intermediate, advanced
Content locked by level, in your gym's progression
Tag any article with a minimum level. Beginners see basics and mobility. Intermediate see progressions toward static skills. Advanced see freestyle. The same library, the right view per member.
A glossary of calisthenics terminology
Calisthenics has its own movement vocabulary. C3NTR's glossary holds the terms in one place: the exercise names, your gym's preferred cues, and the article each term appears in.
- Scapular depression
- Pulling the shoulder blades downward and slightly inward before and during a pulling movement. The foundation of safe, effective pulling in calisthenics.
- False grip
- A grip position where the wrist is folded over the bar so the bar rests in the palm rather than in the fingers.
- Straight-arm support
- An isometric hold in which the arms are fully locked at the elbows, the shoulders are packed down, and the body is upright above the bars or parallettes.
- Dead hang
- Hanging from a bar with arms fully extended and shoulders actively packed, not passive or loose.
- Planche
- A static skill in which the body is held horizontal above the floor or bars with the arms straight and vertical. One of the most advanced pushing skills in calisthenics.
- L-sit
- An isometric hold in which the body is supported on the hands with the legs extended horizontally in front.
Workshops, jams, conditioning blocks
C3NTR isn't only the library. Schedule the next jam, post conditioning blocks, and let members see what's ahead. Announcements land on their Today tab and events sit on the calendar.
Start from our Calisthenics template
A working starter with 17 articles, 2 short videos, a 8-terms glossary across 5 tags (Getting Started, Foundations, Practice, Progression, Resources). Import in a few taps, then edit anything that doesn't fit your school. Every article, term and tag is yours from the moment you import.
See the Calisthenics template Template source:assets/templates/fitness/calisthenics.c3t.md
Inside the app
A look at how the library, articles and grade controls feel in your students' hands.
Plays well with what you already have
Bring your existing programming and exercise notes in with smart Word document import or paste Markdown directly from your coach's archive.
Word documents
Smart import reads headings and turns them into draft articles. You review before anything publishes.
Markdown from any editor
Notion exports, Obsidian notes, Bear, plain .md files. Paste or import.
C3NTR templates
Open .c3t.md format. Schools can share templates with each other without us in the middle.
UK GDPR · DPA 2018
UK GDPR compliant. Hosted in the EU (London).
C3NTR is built around UK data protection law from the ground up. Your school's data sits in the EU on Google Cloud London, the same region we manage from.
UK GDPR + Data Protection Act 2018
Built around UK GDPR Article 6 lawful bases. Subject access requests answered within one calendar month.
Hosted in the EU (London)
Your school's data sits on Google Cloud in the europe-west2 (London) region. No transfer outside the UK or EEA for core operation.
Encrypted in transit
All data is TLS encrypted. Access restricted to personnel with a clear business need.
Account deletion on request
Permanent deletion of personal data and content via in-app or written request.
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
Start free. Move up when you outgrow it.
Seed
Free forever
Up to 30 students
All core features. No credit card.
Start freeSchool
£39/mo
£32/mo billed annually
Up to 150 students
Push notifications. 1 GB media storage.
Choose SchoolAcademy
£69/mo
£57/mo billed annually
Unlimited students
Multi-instructor publishing. Engagement analytics. 5 GB media storage.
Choose AcademyMember? Show this to your coach.
If you train at a calisthenics gym and you'd love a quiet library you can return to between sessions, share this page with your coach. Most gyms start on the free Seed plan in under five minutes.
Common questions
Can members only see their level's material?
Yes. Tag any article with a minimum level. Newer members see only foundations. Coaches see everything, including the deeper programming.
Does it cover WBCF, FIG calisthenics, your gym's progression?
Yes. The starter is method neutral. WBCF, FIG calisthenics, your gym's progression can adapt the programming without rewriting.
Can my gym customise the calisthenics template?
Yes. Every article, exercise and tag is editable. Add your gym's programming, your favoured progressions and your house cues.
How long does it take to set up?
Most schools have a working library in under an hour. Import the starter template in a few taps, then edit anything that doesn't fit. Starting blank takes a little longer. Allow an hour or two to write your first ten articles. Students can use the app the day you publish.
Do I have to stop using my booking system?
No. C3NTR is a knowledge library for your curriculum, terminology and progressions. Booking, billing and scheduling stay with the tools you already use.
Is there a free plan?
Yes. Seed is free forever for up to 30 students, with no credit card required. Move up to School (£39/mo) or Academy (£69/mo) when you outgrow it.
Other fitness disciplines
Teach a different style? Tell us.
Whether it's a specific calisthenics lineage we don't list, or another discipline entirely, drop us a line 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 calisthenics students a knowledge home?
Free for the first 30 students. No credit card. A working library in under an hour.
Start free for your school