Pressure, a workout streak app

Pressure is a weekly workout streak you keep with friends: it tracks runs and lifts, and its bot, runbot, posts each run in the group’s iMessage chat.

A message from runbot, Pressure’s bot, in a group’s iMessage chat: James Han ran 20 miles, crossed 100 total miles and stacked three milestones, including passing another runner on the year’s leaderboard. Friends reacted with fire and a heart.
A run posted to the group’s iMessage chat, with milestones and the leaderboard; another runner’s name is hidden

Result

380+ users

As of October 2026 · Pressure’s production database

5.0 from 11 ratings

5 reviews on the App Store

454 workout posts

In group chats since May 2026 · as of October 3, 2026 · Pressure’s production database

25 updates

Since launch, the latest on September 30, 2026 · the App Store version history

Role
Founder and lead engineer: the product, the iPhone and Apple Watch app, the server and the website
On the App Store
Since July 6, 2026; version 1.0.45, September 30, 2026
Name
Launched on the App Store as Fyt in July 2026 and is now being renamed Pressure. The App Store still lists it as Fyt until version 1.1 ships.
Stack
Swift, SwiftUI, watchOS, HealthKit · TypeScript, Fastify, PostgreSQL · Fly.io
Links
View on the App Store pressure.fyt.life

The problem

Friends who run and lift together already talk every day in iMessage. Their workouts sit in separate apps built around personal logs, so someone has to post each one by hand. Members without the fitness app miss out.

The goal

Put every run and lift in front of the whole group, in the chat they already use, without asking everyone to install an app.

In the app

The App Store screenshot “Every mile, mapped”: the feed with a run’s route map, distance, pace and time, beside its heart rate and calories.
A run in the feed, with its route, distance, pace and heart rate
The App Store screenshot “Record your run, live”: an iPhone ready to start a run on a map, beside an Apple Watch recording one.
Recording a run live, on iPhone and Apple Watch
The App Store screenshot “Every lift, logged”: a finished gym session with a muscle diagram, sets, total volume and the exercises done, under the week’s totals.
A finished gym session: sets, volume and the muscles trained
The App Store screenshot “Track your lift, live”: a gym session in progress, with weights and reps checked off set by set.
Logging a lift live, set by set

From the App Store screenshots.

The website

pressure.fyt.life’s home page on a desktop: the headline “The all-in-one fitness tracker.”, the App Store badge and a link to text runbot, beside a group chat in which the bot announces runs and the year’s leaderboard. Runners’ names are blurred.
The home page on a desktop, with a group chat as runbot posts it
pressure.fyt.life’s home page on an iPhone: the same headline, App Store badge and link to the bot, above the group chat. Runners’ names and a town are blurred.
The same page on an iPhone
pressure.fyt.life’s stats page: active groups, runners, runs and miles tracked across all time and the last seven days, then the weekly activity so far this year.
The stats page: totals for runners in active group chats, from Pressure’s database
pressure.fyt.life’s FAQ page: five questions, the first opened to say the app is free with an optional subscription, above the footer every page shares.
The FAQ, in the header and footer every page shares

From pressure.fyt.life; members’ names and towns are blurred.

What I built

Decisions

  1. Give the group a shared record.

    Every workout lands in the shared feed and on the group’s leaderboard. Personal records are called out to everyone.

    Why: the group can follow each other’s progress in the same place.

  2. Announce in the chat people already use.

    Shortly after a run, runbot posts in the group’s iMessage chat:

    • The workout.
    • Personal records.
    • Leaderboard changes.
    • A link to the full workout.

    A group can switch lifts on too. Everyone in the chat sees the post, including members without the app.

    Why: a new app is one more place to check; the group chat is already open.

    Trade-off: the posts go out through Messages on a Mac that has to stay running.

  3. Record on the wrist.

    The Apple Watch app records a run with live GPS, pace, distance and heart rate, and sends the finished run straight to Pressure’s server.

    Why: the watch is already on the runner’s wrist; the phone does not have to come along to record the run.

Contact

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