Independent gyms
One head coach, an assistant or two, and a steady stream of boxers. C3NTR puts your stance, combinations and conditioning in one place. No second tool, no spreadsheet.
For martial arts schools
A knowledge home for your boxing gym.
Stance, footwork, the six punches and the rounds.
→ See a quick tour
Free for up to 30 students
No credit card
UK GDPR · EU (London)
Works offline
Your gym's craft deserves a home
Combinations live in the coach's head and on the pad work. New members don't know what 1-1-2 to the body means. Defensive shapes get demonstrated mid-round and never make it onto the page. C3NTR is a quiet place to write it all down once.
Who this is for
Schools with multiple coaches
Two or more coaches, several classes a week. C3NTR holds the shared standard so every coach teaches the same fundamentals.
Competition gyms
Amateur, pro, or both. Content locked by level keeps novices on basics while open-class fighters see the deeper game.
Built for teachers, not for IT
Your head coach opens the app, taps Edit, and writes the next combination breakdown in plain prose. The next pad session, the boxers know the shape.
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.
Novice, amateur, open and pro
Content locked by level, in your gym's progression
Tag any article with a minimum level. New members see the jab, the stance and the footwork. Amateurs see combinations and clinch work. Pros see ring craft and game-planning. The same library, the right view per fighter.
A glossary of boxing terminology
Every gym has its own combinations, its own cues, its own shorthand. C3NTR's glossary holds the language in one place: your gym's terms, plain definitions, and the articles each term appears in.
- Hand wrap
- A long cotton or elastic wrap worn under boxing gloves to protect the knuckles, small bones of the hand, and the wrist.
- Jab
- The straight punch from your lead hand. Fast, light, and constantly used, a boxer's main tool for finding range, setting tempo, and opening up combinations.
- Cross
- The straight punch from your rear hand. Heavier than the jab because more of your body powers it.
- Hook
- A curved punch thrown with either hand, with the elbow bent at roughly ninety degrees.
- Uppercut
- A rising punch from either hand, aimed at the chin or the body from below.
- Orthodox
- The stance used by right-handed boxers, left foot forward, right hand at the rear.
Sparring nights, fight cards, gym closures
C3NTR isn't only the library. Schedule sparring nights, post the fight card, and let members see what's coming up at the gym this month. Announcements land on their Today tab and events sit on the calendar.
Start from our Boxing template
A working starter with 15 articles, 2 short videos, a 10-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 Boxing template Template source:assets/templates/martial_arts/boxing.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 combination drills and conditioning blocks in with smart Word document import or paste Markdown directly from your coach's notes.
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 AcademyBoxer? Show this to your coach.
If you train at a boxing 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 boxers only see their level's material?
Yes. Tag any article with a minimum level. Novices see only basics. Open and pro see everything.
Does it cover amateur (AIBA) and pro rules?
Yes. The starter includes notes on AIBA / IBA amateur scoring and the professional rounds, with space for your gym's focus.
Can my gym customise the boxing template?
Yes. Every article, combination and term is editable. Add your gym's favoured combinations, your conditioning blocks and your house rules.
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.
Teach a different style? Tell us.
Whether it's a specific boxing 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 boxing 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