Work in progressAugust 2026

Workout Trainer

An Android workout app that shows the movement in 3D and lets you log weight and reps — the combo I couldn't find in existing apps.

Kotlin
Jetpack Compose
Android
Room
SceneView
Blender
3D

Project gallery

Workout Trainer preview

Image 1 of 2

Overview

Most workout apps I tried were strong on one side and weak on the other. Some showed form well but ran on a timer. Others were great for logging sets and load, but felt like a spreadsheet and never showed the movement. I'm building Workout Trainer for Android to do both in one place: browse a catalog, build workouts, see which muscles you're working, run a session with a 3D character demonstrating the exercise, and keep history of weight and reps over time.

What it does

Profile setup (units, basic stats)
Exercise catalog filtered by type, muscle group, and equipment
Custom workouts authored from that catalog
Live sessions: character animation for the active exercise while you log sets
Immutable history so past sessions stay accurate even if you edit a workout later

How it's built

Native Android with Kotlin, Jetpack Compose, and a multi-module Gradle layout. Domain logic stays testable (including a pure Kotlin workout engine). Persistence is local-first with Room and a seeded exercise/character catalog. 3D demos use SceneView / Filament with characters and clips exported from Blender as GLB. Rendering is optional: if a model fails, the workout still runs with a static fallback. I'm building it with Cursor as much to learn AI-assisted development on a real product as to ship the app itself. It might stay a personal tool; if it's good enough, I may put it on the Play Store for a small price. For the longer story, see the linked blog post.

Latest update

September 12, 2026

Workout Trainer: character mesh cleanup and FreeMoCap animation tests

I'm currently working on the 3D character and the animation workflow for the Workout Trainer app.

Character pipeline

I generated a new model in Tripo 3D, then brought it into Blender to:

clean up and fix the mesh
redo the UVs
fix problem areas in the textures

That gives a much more usable base for posing and animation than shipping the raw export.

Animation with FreeMoCap

Next up is animation. I'm using FreeMoCap, an open motion-capture system, to capture workout movements and feed them into the character pipeline.

I ran a first test capture and the results look good so far — solid enough to keep iterating on the workflow.

What's next

I'll share more screenshots as the character and animation pipeline mature. The goal is a repeatable path from mocap take → cleaned clip → in-app workout animation.

More updates

I Couldn’t Find a Workout App That Fit. So I’m Building One.August 18, 2026The workout apps I tried were either great at showing the movement or good at logging weight and reps — never both. So I’m building my own Android app with Cursor, and if it turns out well enough, I might put it on the Play Store for a small price.