RepDB
Blog
Notes from building RepDB and shipping fitness apps.
Animated WebP vs MP4 for Exercise Animations
One transparent master, two deliveries: when to ship the animated WebP and when to export an MP4 — measured on real exercise clips.
Best Exercise Datasets with Animations for Fitness Apps (2026)
RepDB, Vital Animations, GymVisual and MoveKit compared on transparent backgrounds, smooth motion and consistent characters, with sample findings.
Exercise Animations in Videos: WebP to MP4
Convert transparent exercise WebP to MP4, GIF, or an alpha video layer with practical export steps and common mistakes.
Fitness App Themes with Transparent Animations
Use transparent exercise animations for dark mode, brand colours, gradients, and consistent fitness app themes.
How to Use Exercise Images in a Fitness App
What an exercise image costs, measured across 442 clips and 936 stills — and which asset belongs on cards, detail pages, and full-screen views.
Lazy-Loading Exercise Animations in Fitness Apps
A complete still-first pattern: click-to-play, one active clip, reduced motion — with the decode budget measured on a 12-card catalogue grid.
Exercise Dataset Licenses for Commercial Apps
free-exercise-db, wrkout/exercises.json, Kaggle scrapes, paid APIs — what each one actually lets you ship, and why the images are the real risk, not the JSON.
ExerciseDB Alternatives 2026: 4 Datasets
ExerciseDB alternative compared with WorkoutX, free-exercise-db, and RepDB, focusing on images, catalogue depth, schema, and pricing.