Jonathan Lee

Co-founder & CEO @getfuelin ⛽️ | Democratizing access to world-class personalized nutrition coaching | Ironman Triathlete 🏊‍♂️ 🚴‍♂️ 🏃‍♂️| Ex-Accenture

[Jonathan Lee @JonathanLee]

@rajatsuri I like to separate my work vs. personal AI use. Having to toggle between work and personal Claude/ChatGPT accounts is clunky.

Using Muse as the daily driver for all things in my personal life has been great. It’s fast and the UI is more consumer focused.

[Jonathan Lee @JonathanLee]

First 24 hours of test driving Muse and I’m impressed how well the product was executed.

The team clearly put a lot of thought into the design and performance of the app.

The app is clean and intuitive, it works really fast compared to other agents I’ve tried and it nails just sharing the right amount of progress updates when executing a task to keep you informed but not overwhelmed.

Well done @alelxander and team!

[Jonathan Lee @JonathanLee]

@aashaysanghvi_ Love my @peakdesignltd Travel Backpack if you’re looking for something with more space.

I pack my gym bag clothes/shoes in it and don’t need separate gym bag. I’ve also done 3-4 day trips with just this backpack.

[Jonathan Lee @JonathanLee]

@elonmusk Excited to see @SpaceX expand to Louisiana! It’ll be a great boost for the hard-working people in the state.

[Marie Haynes @Marie_Haynes]

The outrage over Anthropic watermarking Claude outputs is wild considering Google has been doing the exact same thing with SynthID for 3 years now.

[Jonathan Lee @JonathanLee]

@iuditg The reality is all other AI models will have to do the same thing to comply with the EU AI Act’s Article 50 transparency rules

[Jonathan Lee @JonathanLee]

“That’s it, I’m unsubscribing from Claude!” , one of many similar reactions on X to news that Anthropic is going to add watermarks to text and code generated from Claude.

TLDR: All other AI models will also have to watermark their output to comply with EU AI regulation.

The full picture:

To comply with the EU AI Act’s Article 50 transparency rules, all new AI model output released after Aug 2 2026 need to include a watermark. Existing models have until Dec 2 2026 to comply.

The regulation is mandatory and carries hefty fines of up to €15 million, or 3% of total worldwide annual revenue (whichever is higher) for those that don’t comply.

It’s such high stakes for non-compliance, ALL major AI companies (OpenAI, Google, Meta etc.) have signed the same EU Code of Practice Anthropic signed stating that they will comply.

So why is all the news and backlash aimed at Anthropic doing this when all the other AI companies will have to do this as well?

Anthropic just added a support article outlining how the watermark will work to comply with the regulation and users and the media jumped on it.

Since the regulation just went into effect on August 2nd for all NEW models, they may be releasing a new model soon and wanted to get this in place. All other models will have to follow suit as they release new models.

[Jonathan Lee @JonathanLee]

@thisisgrantlee As a byproduct, as more people build things themselves, they’ll start to respect how much work goes into great products. The best ones look simple on the surface, but that simplicity hides hundreds or thousands of small decisions that make them truly great.

[Jonathan Lee @JonathanLee]

At some point last year, I realized I didn’t recognize myself.

I didn’t feel like an athlete anymore.

For more than a decade, I trained like one.
5am swims. Long weekend runs. 20+ races. A full IRONMAN. Training wasn’t a hobby. It was who I was.

Then I started @getfuelin.

That’s when the drift began.

Late nights.
No weekends.
Every spare hour went into the company.

When it’s your company, it’s personal. You’ll give it everything.

Training got pushed to tomorrow. Then next week. Then after the next launch.

Eventually “later” just meant never....

Nothing dramatic happened. I just stopped holding the line.

And once you stop physically, it bleeds into everything else. Energy drops. Focus slips. You feel it.

So I reset. Small.

Twice a week, I showed up to the gym. Even if I only had 15 minutes. No debate.

SOMETHING beats NOTHING.

Around that time I watched Physical: 100 on Netflix.

100 athletes. Brutal tests. Strength, endurance, grit.
It reminded me what it feels like to choose discomfort. To breathe hard. To stay in it.

That was enough.

I signed up for a HYROX race that was 12 weeks out. Clear date. Training schedule: 45–90 minute sessions, 4–5 days a week. Manageable, even as a founder.

This past weekend, I raced my first HYROX.

Three months from barely training to back on a start line.

Here’s what hit me:

If you run a company focused on health and performance, you can’t outsource your own standard.

Culture starts at the top.

So at Fuelin, we set a team goal: everyone signs up for at least one race in 2026. 5K. Marathon. Ultra. Doesn’t matter. Just commit.

I’m running the San Francisco Marathon in July.
My co-founder is running the Boston Marathon in April.
The rest of the team is locking in their own events.

Here’s the brutal truth as a founder:

Your company will take everything if you let it.
Time. Energy. Health.

It won’t draw boundaries for you.
You have to decide where the line is.

Build the company. But build yourself too.

Because the plane doesn’t fly far without the pilot.

If you’ve been “too busy” and your standard has slipped, this is your nudge.

You’re an athlete too.

Start small.
Set a date.
Hold the line.

[Jonathan Lee @JonathanLee]

Congrats @SpaceX, @elonmusk and team!!

A little over a decade ago I had the incredible opportunity to visit SpaceX’s factory in Hawthorne, CA and Elon showed us a non-public early video of a successful reusable booster landing. The progress since has been mind blowing.

Thanks for brining us closer to the future!

[SpaceX @SpaceX]

Mechazilla has caught the Super Heavy booster!

[Jonathan Lee @JonathanLee]

@doctorinigo Sorry for your loss ❤️ Cancer’s brutal…. I lost my dad to it a few years back too. Can’t wait for the day we find a cure.

[Jonathan Lee @JonathanLee]

Sad to hear about Dikembe Mutombo’s passing. I wrote a report and even presented about him in middle school—he was my favorite player when he starred for the Denver Nuggets. Met him once and got an autograph at the local Foot Locker. His character and impact off the court were just as great. RIP to a true legend.

[Earvin Magic Johnson @MagicJohnson]

I’m so heartbroken to hear about the passing of my dear friend and basketball Hall of Famer, Dikembe Mutombo. He was not only a great basketball player who could protect the rim as an elite shot-blocker, but also an incredible man with a pure heart of gold. He dedicated much of his life to serving others, which is evident through his lasting impact both in the U.S. and in Africa. Through his foundation, he helped build a remarkable $29 million hospital in his home country of Congo, personally contributing $15 million to the project! As an NBA Global Ambassador and a goodwill ambassador for the United Nations, he received numerous well-deserved awards over the years for his humanitarian efforts.

I will truly miss his big smile, his spirit, and his powerful voice. Cookie and I are keeping his wife Rose, his children, and the rest of his family in our thoughts and prayers during this incredibly difficult time. 🙏🏾

[Jonathan Lee @JonathanLee]

@blader So glad Mira’s surgery went well. Sending love and positive vibes your way ❤️

[Jonathan Lee @JonathanLee]

@garrytan LFG! 💪

[Jonathan Lee @JonathanLee]

@HarryStebbings For busy founders, this hits home. Don’t forget to spend time with the people who matter most.

Booked my flight to see my mother next week! Now if I could only convince her to walk a marathon with me 😆

[Jonathan Lee @JonathanLee]

@mwseibel 💯agreed. the pendulum has swung too far towards b2b... excited to see and be part of the next wave of consumer startups build category-defining companies

[Jonathan Lee @JonathanLee]

@elonmusk @SpaceX @rookisaacman @PolarisProgram Congrats @elonmusk and @SpaceX !!

[Jonathan Lee @JonathanLee]

@Austen Same here! 💯 I’d totally pay more and fly exclusively on airlines with Starlink. Been super frustrated with slow and unreliable airplane WiFi…