We’ve been here before

Machines replaced muscle, so we built gyms.

When the Industrial Revolution took physical labor off our plates, we didn’t stop training our bodies. We invented exercise on purpose. By 1899 people were pressing barbells lying on their backs, the lift that became the bench press. Today the human body has never been more optimized.

Now AI is taking the thinking off our plates. The mind needs its gym.

The body, 1800sThe mind, now

Machines took over physical labor

→

AI takes over mental labor

Bodies went soft from disuse

→

Minds go soft. Mental obesity.

We built gyms and the bench press

→

We built Gymnasion

The whole gym, in one place

Everything your mind needs to train.

Other apps give you one machine. Gymnasion gives you the whole gym.

Strategy and logic games

Chess tactics, Sudoku, logic grids, and pattern puzzles. The classics that make you think a few moves ahead.

The sparring coach

An AI coach that asks instead of answers. It pokes holes in your reasoning and makes you defend it.

Philosophy and great ideas

Short readings from philosophers and great thinkers, with questions that make you wrestle with big ideas instead of skimming them.

Your daily program

A quick assessment shapes a daily workout that pulls from all of it, built around where you’re strong and where you need work.

Brain game appsPuzzles only

Reading and course appsContent only

AI chatbotsDo the thinking for you

GymnasionAll of it, in one place, built to make you think

A day at the Gymnasion

One workout. Every kind of rep.

Warm-up · Logic

Fill the grid

13 42 24 31

Plus chess tactics, logic grids, and pattern puzzles that rotate daily.

Read · Philosophy

“The unexamined life is not worth living.”

Socrates, in Plato’s Apology

If an AI does your examining for you, is your life still examined? Make your case.

Main lift · Sparring

I think it’s fine as long as I check the AI’s work.

How would you know it’s wrong if you never did the work yourself?

The coach argues back until your reasoning holds up.

Cooldown · Progress

Day 12 streak

A quick recap of what you did well, what to sharpen tomorrow, and your streak.

What you’ll train

LogicStrategyCritical thinkingReasoning and argumentEstimationDecision-makingBig-picture thinking

Legal

Privacy Policy

Effective October 14, 2026

Gymnasion (“we,” “us”) is building a mental fitness app. This policy explains what information we collect through gymnasion.ai, how we use it, and the choices you have. We’ve kept it short and plain on purpose.

What we collect

Your email address, if you join our waitlist.
Basic technical information that any website receives when you visit, such as your IP address, browser type, and the pages you view. Our hosting provider records this automatically for security and to keep the site running.

We don’t ask for your name, phone number, payment details, or any other personal information on this site.

How we use it

To send you updates about Gymnasion, including early access invitations and launch news.
To understand how many people are interested and improve what we’re building.
To keep the site secure and working properly.

Who we share it with

We never sell your information. We only share it with the services we use to run the site:

Kit (kit.com) stores our waitlist and sends our emails.
Netlify (netlify.com) hosts this website.
Google Fonts provides the fonts on this site, which means your browser connects to Google when the page loads.

Each of these services handles data under its own privacy policy. We may also share information if the law requires it.

Cookies

We don’t use advertising or tracking cookies on this site.

How long we keep it

We keep your email address until you unsubscribe or ask us to delete it, or until we no longer need it for the purposes above.

Your choices

Unsubscribe anytime using the link at the bottom of any email we send.
Ask us to show you, correct, or delete the information we have about you by emailing gymnasion.app@gmail.com. Depending on where you live, such as California or the European Union, you may have additional rights under local privacy laws, and we’ll honor those requests.

Children

This site isn’t directed to children under 13, and we don’t knowingly collect information from them. If you believe a child has signed up, contact us and we’ll delete it.

Security

We use trusted providers and take reasonable steps to protect your information, but no method of storing or sending data online is 100% secure.

Changes to this policy

If we update this policy, we’ll post the new version here and change the effective date above. If the changes are significant, we’ll let waitlist members know by email.

Contact

Questions about privacy? Email us at gymnasion.app@gmail.com.

Back to Gymnasion

Don’t outsource your mind. Optimize it.