Mosi

Fitness coach 🏋️+ PhD researcher 🧬 (Sport & Exercise Science)
Solo-building @growgenio — the fitness identity layer gym apps forgot.

[Dan Go @CoachDanGo]

I wore an Apple Watch, Whoop, Oura, and Fitbit Air at the same time for a week.

I expected the data to be similar but did not expect this.

Here's what every wearable owner needs to know:

[Mosi @m0si0]

Fitness apps solved tracking.
Steps counted. Calories logged. Sleep scored.

But after years of data, most people still can't answer:
"What kind of athlete am I?"

[Mosi @m0si0]

@jmj @theamiralek Depends on your moat.

Code → stealth makes sense.

Expertise, trust, community → building in public IS the strategy.

You can’t copy a founder’s credibility.

[Mosi @m0si0]

Ran a 1-month gamification experiment with my PT clients in April.

Built a leaderboard inside their training app. Points for sessions. Vague reward at the end.

What surprised me:
Clients I never thought were competitive went from 2 sessions a week to 5.

The reward wasn't the driver. The leaderboard was.
Visibility changes behavior more than incentives.

[Mosi @m0si0]

@_brian_johnson That's the hardest UX problem in health tech. Confidence without noise. Most apps get it backwards.

[Mosi @m0si0]

Asked my PT colleague and clients about Cal AI this week.

They'd heard of it. None had tried it.

The reason wasn't features or accuracy. It was the "AI" in the name.

For one audience, "AI" signals innovation. For another, it signals distance or distrust.

In health tech, your brand can attract one group and quietly repel another.

[Mosi @m0si0]

Used Whoop for a year. By month 8, I was done — only finished it because I'd prepaid.

That's not product-market fit. That's sunk cost.
This week Google launched a subscription-free Whoop rival.

The market just voted.

[Mosi @m0si0]

@Marty_FTT Good point on Whoop. I’ve personally had issues with the wrist band too, especially on cable machines at certain angles. Better than a watch, but the bicep strap solved most of that for me.

Rings are great when they disappear during sleep, but lifting exposes the limits fast.

[Mosi @m0si0]

Talked with my PT clients about Oura rings today.

I thought the form factor was smart, small, unnoticeable, less intrusive than a watch.

Their feedback surprised me:

"Annoying during pull-ups."
"Bar presses on it during bench."
"Just doesn't feel right."

Adoption isn't about what tech measures. It's about whether people can live with it.