2 founding installs open · Q3 2026
For Independent Gym Owners

Your gym is bleeding revenue you can't see.

Cero OS™ is one AI system that runs your front office while you sleep. It answers new leads in seconds, wins back members who drift off, and asks your happiest members for reviews. You read one short text every morning. That's it.

Built by an MD who ran a gym / Done in 30 days / Money back if it doesn't work
Built like medicine · MD-led · 30-day money-back guarantee
One system
Cero OS™ runs your whole front office, not four separate tools.
MD-led
Built by a doctor who ran a gym.
Guaranteed
30-day money-back. You keep every system I built.
01 · The problem

Four holes. One system that closes them.

Every independent gym bleeds revenue through the same four holes. You feel them as stress. Here is what each one actually costs.

Lead Bleed

The messages that disappear before you respond. The 9 PM message you saw at 7 AM. The voicemail nobody calls back. Industry data: 50% of gym leads never get a single follow-up. At $517 in lost lifetime value per missed lead, the average gym leaves $26,000 a year on the table.

Member Bleed

The members who drift away without ever canceling. Attendance drops to once a week. Then nothing. The card still pays. The dashboard still says active. By the time you notice, they're already gone for good. In a 200-member gym, that's $160,000 in lifetime revenue walking out the back door each year.

Reputation Bleed

The reviews you never asked for. The content you don't have time to post. The Google ranking your competitor is winning by default. Gyms below 4.2 stars lose 38% of their click-to-call traffic.

Time Bleed

Admin work that shouldn't be yours. DMs at 11 PM. Billing questions. Schedule shuffling. Captions you don't have time to write. The hours that vanish before you've coached a single class. 10–20 hours a week. Gone.

Run your Bleed Map and see exactly what each hole is costing you, in hours and in dollars. Then Cero OS™ closes them.

Run the Bleed Map · $1,500
02 · A morning with Cero OS™

While you slept, Cero OS™ handled the night.

You don't log in. You don't approve every message. You read one brief at 7am, tap approve, and go coach.

# daily-brief
Auto-posted every morning by Cero OS™
Today
NEW
C
Cero OS™APP7:02 AM

Good morning, Mike. Here's where things stand for Monday, June 1.

Handled overnight
  • Answered 12 inbound leads and booked 3 tours
  • Re-engaged 5 cold leads. 2 replied and rebooked
  • Caught 4 members drifting toward cancellation and checked in on each
  • Sent 6 review requests and landed 2 new 5-star reviews
Needs you
  • Carlos M. asked to move his Friday tour to Saturday. Want me to confirm?
  • A member asked for a refund. I held it and flagged it for you. No auto-reply.
Recommended moves
  • Approve this week's win-back text to 4 lapsed members
  • Approve the nurture email. It's ready to send at noon
👍 1👀 2+
Reply to Cero OS™…

This is the whole interface. One brief, every morning.

2 founding installs open · Q3 2026

Be one of the first gyms running Cero OS™.

You get the full install at founding-client pricing. I get a filmed case study and permission to use your numbers. That is the trade.

I need the proof to show the next 20 owners this works. If that is worth it to you, start with a Bleed Map.

Apply for a founding build →
03 · What's inside Cero OS™

One install. Four jobs it never stops doing.

Closes Lead Bleed

Lead Recovery Engine

Every missed call, DM, or form gets a real reply in under 60 seconds, day or night, until they answer or book.

Closes Member Bleed

Attendance Pulse

Members quit weeks before they cancel. The moment attendance slips, they get a personal check-in. You catch the drift while you can still reach them.

Closes Reputation Bleed

Reputation Engine

After a member win, Cero OS™ asks for the review at the moment they are happiest. Your rating climbs without you chasing it.

Four modules. One system. Your Bleed Map decides which we turn on first.

04 · How it works

Three steps to a gym that runs itself.

Step 01

Diagnose

A 90-minute Bleed Map. I find exactly where your gym is bleeding hours and revenue, and hand you a written, MD-signed report in 24 hours. Yours to keep.

$1,500
Step 02

Install

I build Cero OS™ on top of the tools you already use. You don't touch a thing. No new logins. No new staff. Most installs wrap in 30 days.

21–30 days
Step 03

It runs

Cero OS™ works on its own and you read one digest a morning. I monitor for 30 days. If you don't get the hours and leads back, you get a 100% refund, and you keep every system I built.

Guaranteed
05 · Built like medicine

Most AI agencies sell you features. I built one system that runs the gym.

We diagnose before we prescribe. That is how medicine works. You don't write a prescription before you take a history, and you don't install AI before you measure what's broken.

Most gym owners we talk to have been pitched "AI agents" and "automation suites" and "workflow optimization platforms." They've bought tools that came with logins they never used. We don't sell software. We diagnose, build, and prove it works. If it doesn't, you don't pay.

Built by an MD who ran a gym.

Mauro Castillo · Founder, Cero To AI

I opened a gym in 2020. By 2022 I was first in, last out. Answering DMs at 11 PM. Missing calls during morning class. Forgetting to follow up with the lead from Tuesday.

I did what everyone told me to do. Hired a front desk person. Bought the software. I still drowned.

My team did their jobs. The software did its job. The pieces never connected. Every part of running a gym that should have been a system was being held together by my memory and my late nights.

So I built Cero OS™. One system that does the work I wish someone had done for me, so the next gym owner doesn't lose Saturdays to admin and Sundays to guilt.

  • Doctor of Medicine
  • Master of Science, Sports Training
  • CSCS, Certified Strength & Conditioning
  • Former gym owner (2020–2022)
Runs on your stack
Mindbody · Wodify · PushPress · GHL · Google · Meta + your CRM
Cero OS™ sits on top of the tools you already use. You never log in.
06 · The Guarantee

If it doesn't work, you don't pay. And you keep what I built.

30 Day Money Back

Get 10+ hours back and recover at least $5,000 in dead leads in 30 days. Or get a 100% refund.

No hoops. No small print. No "performance reviews" stretched out 90 days while I extract retainers from your account.

If the numbers in your Bleed Map don't move by the end of Week 4, you get every dollar back.

And you keep every workflow, every agent, every system, and every dollar I recovered during the build.
07 · What it costs

One product. One way in, one build, one engine that keeps it running.

Cero OS™ is the product. The Bleed Map is how you start, the install is the build, and Cero Care keeps it tuned. One scope, one fixed price, one guarantee.

The path to Cero OS™

Year-one value $12,500
The Bleed Map
Paid 90-minute diagnostic. Written, MD-signed report quantifying every leak. Credits in full toward your install.
$1,500
The Install
Cero OS™ configured on your stack and launched. Done in 30 days. You don't touch a thing.
$3,500
Cero Care
It runs on its own. Monitoring, tuning, a fresh Bleed Map every month, and a quarterly call. First 30 days included.
$750/mo
Year one, one gym $12,500
Bleed Map + Install + 12 months of Cero Care
A part-time front desk hire runs about $24,000/year. Cero OS™ starts at $1,500 to diagnose, $3,500 to install.

P.S. The Bleed Map credits in full toward your install. You start by finding the money, not spending it.

Before you book

Read a sample Bleed Map first.

Not ready to spend $1,500 with someone you just met? Fair. Read a sample report instead. MD-signed, run on a sample gym, every leak priced in dollars. Four minutes to read. Then decide if you want yours.

No spam. One opt-out link in every email.

08 · Questions gym owners ask

The questions every gym owner asks first.

What if I'm not technical at all? +
That is the point. You never log into Cero OS™. You don't manage it. I install it, it runs on its own, and you read one short text each morning.
I'm burned out. Will this actually help, or is it just another tool I'll abandon? +
Burnout in a gym owner comes from working hard with no path forward in sight. Cero To AI builds the path. The Bleed Map names every leak, in writing, signed by an MD. The 30-day build stops them. The goal is a gym that runs without you holding your breath.
I tried a chatbot once. My members hated it. +
That was a 2019 old menu-style bot. It got stuck on repeat when anyone asked anything off-menu, then dumped the conversation. Cero To AI builds with 2026 models. They remember what you said, they hand off to a human when stuck, they sound like your brand. Watch the 60-second Cero OS™ demo higher up this page.
95% of AI pilots fail. Why is this different? +
Because 95% of AI pilots ship a tool and walk away. We diagnose first, build for what you actually need, monitor for 30 days, and refund 100% if the numbers don't move by Week 4. That's the difference.
How long does this take? +
21–30 days from the Bleed Map to launch.
Do I need to buy new software? +
No. Cero OS™ sits on top of what you already use. Mindbody, Wodify, PushPress, GHL, whatever it is. If you're using nothing, I'll tell you what's worth it.
What if it doesn't work for my gym? +
100% refund. You keep every workflow, every agent, every system, and every dollar recovered during the build. The 10+ hours back and revenue recovery IS the guarantee. Either the install hits the numbers by end of Week 4, or it didn't work and you don't pay. No performance reviews stretched out 90 days.
What about after launch, do you disappear? +
No. 30 days of monitoring is included. After that, Cero Care™ keeps Cero OS™ tuned. Monthly monitoring, a fresh Bleed Map, and a quarterly call. Cancel any time. The system stays yours either way.
Will my team hate it? +
Your team will love it. The system does the work nobody on staff wants to do.
Last thing

You can keep running the front office yourself. Or you can let Cero OS™ do it.

Start with the Bleed Map. 90 minutes with a doctor. A written diagnostic of every leak in your gym, quantified in dollars. Credits in full toward your install.

Run the Bleed Map · $1,500 →