Juan Saravia ESEN

Work · Fitness · AI app

Mi Rutina

An AI-built gym plan that adjusts itself every week, plus a portal for trainers to follow their athletes.

Mi Rutina, screen 1Mi Rutina, screen 2
Saturday · your plan adjustedEasy → +2 reps next week
RoleProduct · Full-stack · AI
Year2026
StatusIn production

Overview

Mi Rutina builds your gym plan with AI and adjusts it every week based on how it went. You answer eight questions and get a plan with exercises, sets and starting weights.

On each exercise you tap Easy, Just right or Missed, and on Saturday the reps or the weight go up. Weights come from fixed rules, not from the AI: the AI swaps an exercise that has stalled for weeks or that bothers you, sums up your week and answers mid-session. If you train with someone, your trainer builds the plan in their portal and gets everything you log and note.

Features

What it does.

AI plan

Eight questions (goal, days, time, place and aches) and your week comes out with exercises, sets and starting weights.

Adjusts every Saturday

Easy, Just right or Missed. Reps go up first and, at the top of the range, the weight, with fixed rules.

Trainer portal

All their athletes on one screen, a workout editor and every session’s marks and notes, also by email.

Mid-session assistant

Machine taken? It knows today’s workout and swaps an exercise or adjusts the weight on the spot.

At the gym

170+ exercises with GIFs, a rest timer that starts itself and your progress on every lift, week by week.

Light or dark

A violet design that follows the iPhone’s mode. Installable PWA, no app stores.

How it works

From start to finish.

  1. Eight questions

    Goal, days, time, place and what bothers you.

    PWA
  2. AI plan

    Claude builds your week with exercises, sets and starting weights.

    Claude
  3. At the gym

    You tap each exercise: Easy, Just right or Missed.

    Worker API · KV
  4. Every Saturday

    Fixed rules raise reps or weight; the AI sums up the week.

    Cron triggers
  5. Your trainer

    Gets your marks and notes in their portal and by email.

    Email

Screens

How it looks.

Tech specs

How it is built.

Frontend

  • HTML/CSS/JS
  • PWA + Service Worker
  • Light and dark mode

Backend

  • Cloudflare Workers
  • KV
  • R2
  • Cron triggers

AI & build

  • Claude Sonnet 5
  • Claude Haiku 4.5
  • Playwright
  • Remotion

Integrations

  • Claude API — builds the plan, sums up the week and answers in the chat
  • Cron triggers — the automatic Saturday adjustment
  • Email — trainers get every session’s marks and notes
  • Remotion — Instagram carousels for marketing

Method

  • Fixed, auditable progression rules; the AI only proposes exercise swaps and explains the week · custom AI agents (a trainer with athlete memory, an app designer) · visual audits with Playwright screenshots · a Remotion marketing pipeline.