TheroxEarly access
// Train without the guesswork

AI fitness
redefined.

Every rep on the record.

Your coaches' videos in one vault. On-device AI that watches your form while you lift. A crew that keeps you honest.

Set 01 · 18 reps
Scroll to start the set© 2026 · Built in public
// Form check / 01Push-up · side view · 5 checks● On device

Good form isn't a feeling. It's a line you can see, rep after rep.

Prop your phone and start your set. Therox counts each rep, turns the joints that drift red, and calls out the fix while you move. The video never leaves your phone.

Founder's set · recorded in the appRec · 00:14
  1. 01

    Depth

    How low each rep goes. A short rep shows up on the check as it happens, not after the set.

  2. 02

    Lockout

    Full extension at the top of every rep. The check lights up when you stop short.

  3. 03

    Body line

    Hips in line with your shoulders and heels. A sagging or piking plank turns those joints red on screen.

  4. 04

    Lowering

    How long the way down takes. Rush it and the cue is "slow the way down".

  5. 05

    Drive

    How long the way back up takes. Grind it out and the cue is "drive up faster".

// Vault / 02Everything you learn from, in one placeYouTube · Instagram · TikTok
  • squats
  • hinges
  • presses
  • overhead work
  • pulls
  • rows
  • arms
  • shoulders

The Vault

Save the coaches you actually learn from. Film the sets you actually do. Let on-device AI watch your form while the bar is still moving.

Plate-loaded rack in a dark gym
3Platforms, one vault
The VaultYouTube, Instagram and TikTok, sorted by lift.
Lifter gripping a loaded barbell
8Movement families
Form checkSquats to lateral raises, checked on device.
Row of hex dumbbells against a brick wall
0Ads, no data sold
Pro · $4.99 / monthFree to start. Upgrade when you want more.

Your form on the record. Your coaches in one place. A crew that keeps you honest.

// Crew / 03Train alone. Answer to someone.Free for everyone

Challenges and the rest of the kit

  • (a)Gym Rat challengesBarbell on a foggy gym floorLaunching
    with the app
    Share a code, compete with friends, and let the leaderboard settle who actually showed up.
  • (b)Form historyEvery checked set
  • (c)Voice cuesCalled out mid-set
  • (d)Your weekly planA folder for each day

// Early access · Free to start · 18+

Tired of guessing how that set looked?Prop your phone. Watch it back.

A training watch on a wrist, photographed in low light
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