AI does the thinking. You do the work.
Stupid Simple Fitness

Stupid Simple Fitness · early access

AI does the thinking.
You do the work.

Custom workout plans built around your goal, your gym (or lack thereof), and your week. We track every set, watch what's working, and revise the plan as you go. Fitness is a formula. We wrote it down.

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14 days free. No card up front. $5/mo or $49/yr after.

What you get

Four things that make this different.

Built for your goal

Not a generic plan with your name on it. Your goal, your schedule, your injuries, your gym. The inputs change the plan.

We show our work

Every recommendation comes with the reasoning chain. What we considered, what we decided, why. You don't have to look. But it's always there.

We push back

Most fitness AI is sycophantic. We're not. Unrealistic goals get challenged. Unsafe ones get refused, politely, with an alternative.

Stupid simple

Four onboarding questions. One log screen. One weekly read. No streaks, no badges, no chat coach. The AI does the complicated part.

How it works

Four steps. About a minute to start.

No 14-screen quiz. No "enter your email to see your plan." No assessment videos. Four questions, then you're in the dashboard with a real workout to do today.

  1. 01

    Tell us your goal.

    Four questions: what do you want, by when, how many days a week, what's off-limits. That's it. No personality quiz, no sales funnel.

  2. 02

    We build the plan.

    Real prescriptions, in your dashboard, ready to lift. Sets, reps, loads, rest, plus the reasoning chain so you can see how we got there.

  3. 03

    You start lifting.

    Today, not tomorrow. One log screen: RPE, completed sets, optional notes. No paywall, no card on file, nothing between you and the bar.

  4. 04

    We tune as you go.

    Weekly recalibration. We read your adherence, RPE, sleep, and tweak the plan. The longer you log, the smarter it gets.

Show, don't tell

Most fitness AI is a black box. We're not.

You get the workout. You also get the math behind it, the inputs we considered, and our willingness to be wrong out loud. Every screen.

Every AI output ships with this

[ Under the hood ] How we built this week's plan

Inputs we considered:

  • goal: add 30 lb to squat 1RM by 2026-07-15 (12 weeks out)
  • last_week_RPE_avg: 7.2 (up 0.4, fatigue trending)
  • sleep_7d_avg: 6h 48m (down 22m)
  • prescribed_volume: 14,200 lb · actual: 14,650 lb
  • missed_sessions_4wk: 0

Reasoning: adherence is high and you're outperforming prescribed volume, but two recovery markers say not to add load. Holding volume flat this week and adding a recovery day Wednesday.

Confidence: medium. If sleep recovers by Friday, we'll add a working set Saturday.

When the math doesn't work, we say so

Why we're built different

Most AI can't say no.

Most "AI workout planners" are rule-based template generators with a chatbot wrapper. Pick from the same three goals, get the same plan as everyone else who picked them. Ask for "lose 25 lb in 4 weeks" and it'll build it. Ask it to ignore your bad knee and it'll oblige. That's the architecture.

Most fitness AI

A template with a personality.

  • Same plan for everyone with similar answers.
  • Validates your goal even when the math doesn't work.
  • Reads your log back to you. Doesn't actually use it.
  • Adapts when you tap a 'regenerate' button. Otherwise, never.

Stupid Simple Fitness

Built to push back.

  • Real plan generation, per user, every week.
  • Challenges goals when the math doesn't work. Refuses unsafe ones.
  • Reads your full log every time it builds a plan.
  • Cites the data when you're winning. The data is the praise.

We will tell you when your goal needs work.

Off the table

What we'll never do.

A list, kept public so future-us doesn't get talked into them in a moment of weakness.

  • Chat coach

    Open-ended AI chat blows out our cost model and dilutes the product.

  • Social feed

    No friends, no comments, no leaderboards. Adherence isn't a competitive sport.

  • Streaks and badges

    Adherence is its own reward. The data is the praise.

  • Quick-fix language

    No 'secrets,' no 'hacks,' no 'transform in 30 days,' no before/after marketing.

  • Medical impersonation

    We are not your doctor, dietitian, or PT. We say it loudly.

  • Data sales

    Ever. Plain-English privacy policy. Journal entries are sacred.

What it costs

Cheap on purpose.

Monthly

$5/mo

Pay as you go. Cancel anytime, no retention call.

save ~18%

Annual

$49/yr

Effectively 9.8 months. Commit and skip the monthly nudge.

14 days free, no card required. We'll ask on day 14, not before.

AI does the thinking.
You do the work.

14 days. No card. About a minute to start.

Start the Free Trial