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 strength & conditioning gym.
Programming, technique, periodisation and the work behind the platform
→ 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
Lift technique gets corrected in coaching but rarely on the page. Programming logic lives in the head coach's head. Periodisation blocks sit across different folders. 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.
Gyms with competitive lifters
You program for competitive lifters and athletes. Content locked by level keeps newer lifters safe while competitive see peaking work.
Built for teachers, not for IT
Your coach opens the app, taps Edit, and writes the next technique note in plain prose. The next session, the lifter knows the cue before they walk to the bar.
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, novice, intermediate, advanced, competitive
Content locked by level, in your gym's progression
Tag any article with a minimum level. Novices see foundations and technique. Intermediate see periodised programming. Competitive lifters see peaking blocks. The same library, the right view per member.
A glossary of strength and conditioning terminology
Strength and conditioning 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.
- Brace
- Full-body tension generated before and during a barbell lift to protect the spine and transfer force efficiently.
- Neutral spine
- The natural, slightly curved position of the spine, not rounded forward, not excessively arched backward.
- Hip hinge
- The fundamental movement pattern of sending the hips backward while maintaining a neutral spine, loading the glutes and hamstrings.
- Progressive overload
- Gradually increasing the demand placed on the body over time so that it continues to adapt and get stronger.
- Rep max (1RM, 3RM, 5RM)
- The maximum weight a lifter can move for a given number of repetitions with good technique.
- Accessory work
- Supplementary exercises performed after the main barbell lifts to address weaknesses, build supporting muscle, and reduce injury risk.
Meets, testing days, programming blocks
C3NTR isn't only the library. Schedule the next meet, post testing days, and let athletes see what's ahead. Announcements land on their Today tab and events sit on the calendar.
Start from our Strength & Conditioning template
A working starter with 14 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 Strength & Conditioning template Template source:assets/templates/fitness/strength_conditioning.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 strength and conditioning 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 NSCA, UKSCA, your S&C method?
Yes. The starter is method neutral. NSCA, UKSCA, your S&C method can adapt the programming without rewriting.
Can my gym customise the strength and conditioning 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 strength & conditioning 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 strength & conditioning 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