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Idea Of The Day - You're In Ohio. Your Friend's In NYC. The Treadmill Is The Same Map.

Author

Needs To Exist
May 08, 2026

In partnership with

GM. This is Needs to Exist (aka NTE), delivering a startup idea about turning lonely cardio into multiplayer cardio.

NTE Pro: 7,000+ startup ideas, sorted by industry and motion. Open it the next time your brain stalls.

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Here’s what we’ve got for you today.

  • The Multiplayer Treadmill

  • The Juice Bar At Equinox Bryant Park

The Multiplayer Treadmill

The One Liner

Your treadmill controls an avatar. Your friends run beside you.

The 140 character tweet (or X) version

Treadmill in Ohio. Treadmill in NYC. Same app, same map. Your avatars sprint through Tokyo at sunset. Cardio just got fun.

The Longer Story Version

The Problem

Cardio is the worst part of fitness. Not because it is hard. Because it is boring.

The average person bails on a treadmill workout at minute eighteen. They did not run out of legs. They ran out of reasons.

Meanwhile, the same person is sitting on FaceTime with a friend across the country, watching a Twitch streamer do squats, screenshotting their Strava ride to a group chat, and refreshing the Peloton leaderboard between intervals.

The behavior already exists. Working out alone, while desperately trying to make it feel like working out together.

The product to make that feel native does not exist yet.

The Solution

A social AR fitness platform where your treadmill, bike, or rower movement controls a live avatar in a shared virtual world. Your friend is at Equinox in NYC. You are at Planet Fitness in Ohio. In the app, you are both biking through Tokyo at sunset.

Core features:

  • Live avatar synced to your gym equipment in real time

  • Friend rooms, public worlds, and creator-led group runs

  • Race modes, exploration modes, accountability streaks

  • Phone-only, no VR headset required

  • Strava and Apple Health export

Think Peloton plus Fortnite social spaces plus the multiplayer Wii Fit nobody ever shipped.

How We'd Build It

Phase 1: One avatar, one room, one friend invite.

  • Spin up the iOS shell on Expo so the same codebase ships everywhere

  • Build the avatar runtime in Unity with AR Foundation for phone-mounted gym use

  • Pull treadmill cadence from iPhone motion sensors and HealthKit before any gym hardware deal

  • Stand up the realtime multiplayer layer on PartyKit so two avatars share a world the second they tap in

  • Ship onboarding, friend graph, and signup on Lovable over a weekend

  • Pipe every minute-on-treadmill, drop-off, and rejoin into PostHog

  • Take subscription payments through RevenueCat

Phase 2: From one room to one world.

  • Add live voice chat between avatars through LiveKit

  • Auto-generate themed environments, Tokyo at sunset, Iceland at midnight, with Meshy

  • Match BPM to run cadence using the Spotify SDK

  • Sync into Strava and Garmin Connect so the avatar run still counts where the wearables track it

  • Run weekly creator-led group runs orchestrated through Customer.io

  • Bill cosmetic unlocks, seasons, and team passes through Stripe

Phase 3: Become the social layer of cardio.

  • Sign gym partnerships through outbound run on Apollo into Equinox, Lifetime, and Crunch ops teams

  • Integrate directly with Peloton bike data and Hydrow rower data

  • Pay creators and instructors through Stripe Connect

  • Open the brand activation layer, Nike, Lululemon, Red Bull, on Cloudflare Workers

  • Track tournaments, leaderboards, and streak ladders in Linear

Why It Needs To Exist

Fitness apps spent ten years optimizing the dashboard. Calories, splits, zones, recovery scores.

The dashboard is not the problem. The dashboard is the consolation prize for the workout you already finished.

The actual problem is the twenty minutes between minute eight and minute twenty-eight, when your legs are fine, your music is fine, and your brain has decided this is the worst use of human time ever invented.

The fix is not better tracking. The fix is better company.

That category does not have a winner yet. It will.

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The Juice Bar At Equinox Bryant Park

The juice bar at Equinox Bryant Park. Tuesday, 7:42pm. Four people, four perspectives, one idea on the table.

Ramon goes first. Head trainer, eighteen years on the floor. He has watched this exact pitch fail five times. Wii Fit. Zwift. Supernatural. Each one had a six-week peak and a two-year decline. People do not want to be a cartoon, he says. They want to be the version of themselves they almost are.

Sofia counters. Built a meditation app that hit 400K downloads and died at month nine. She knows what kills retention, and it is not the cartoon. It is the silence. The first time a user logs in and nobody is there, the app is over. The second time, they uninstall. This product solves the silence on day one. Your friend is already on the bike.

Devi has not said anything yet. She does not work in fitness. She runs sixty miles a month, alone, on a Brooklyn bridge greenway, with podcasts she stopped listening to in March. She has begged her sister in Phoenix to run with her. Her sister will never fly to Brooklyn to run. Her sister might log into an app and run beside her tonight. That is the entire pitch, in one person.

Jordan was a Peloton instructor until last winter. He has done the math under the table. The cohorts that streaked together stayed together. The ones that streaked alone churned at four times the rate. Peloton built that cohort out of camera angles and a leaderboard. This product builds it out of presence. Same drug. Higher dose.

Ramon does not give up. The first time the app lags during a real run, the magic dies. Latency is the brand.

Sofia agrees. Then she says, latency is a solvable engineering problem. Loneliness is not.

Devi pulls out her phone. She has already texted her sister.

Some products do not invent the behavior. They just give it a room.

People are already running alone while watching their friends run alone. The product just has to draw the world.

That is the move NTE Pro is built to spot. 7,000+ ideas indexed by industry, motion, and behavioral wedge, ready to scroll the second your current bet stalls. Some are weekend builds. Some are venture-scale. Some are the third pivot of a pivot you have not made yet.

Every "lonely cardio" in 2026 is an unfinished startup waiting for somebody to draw the room. NTE Pro is the cure for the founder version of the empty treadmill.

The next Peloton is incorporating right now in a Discord nobody you follow is in.

You will read about it in 2028 when the Series A press release hits the feed. By then the design partners will be locked, the instructor roster will be signed, and the avatar IP will be filed.

That is what WhoFiled is built for. Delaware filings the morning they land. Stealth-mode hires from Peloton, Strava, Zwift, and Equinox. "Founding multiplayer engineer" job posts at companies with no homepage yet.

If anyone is raising capital to ship a social avatar layer on top of cardio equipment, WhoFiled is where you will see them before the launch tweet.

The only group that loses is the group that finds out last.

One More Meme