Credits
Illustration and data credits
The movement illustrations on this site are not ours. Here is exactly whose they are and what the licence requires.
The short version
The exercise illustrations on backmaxx.app are adapted from Everkinetic’s open exercise art via Bryl Lim’s workout-guide project, and remain licensed under Creative Commons Attribution-ShareAlike 4.0. The written content, the zone and muscle model, and the coaching cues are BackMaxx’s own.
The exercise illustrations
Every movement frame on this site — the three-position sequences on the exercise pages — is a derivative work, not original art.
The chain is:
| Layer | Source | Licence |
|---|---|---|
| The artwork itself | Everkinetic | CC BY-SA 4.0 |
| Rasterized, recoloured and vector-traced | workout-guide by Bryl Lim | CC BY-SA 4.0 |
| Back-training subset, resized and re-encoded for the web | BackMaxx | CC BY-SA 4.0 |
Because CC BY-SA 4.0 is a share-alike licence, our adaptations stay under the same licence. You may reuse the illustrations on this site under CC BY-SA 4.0, provided you credit the chain above and licence your own adaptation the same way.
What we changed: selected a back-training subset, recoloured the line work from white to dark ink so it reads on a light page, resized the frames to 400×400 and re-encoded them as AVIF and WebP. The drawing itself — every line and position — is unmodified upstream work.
The exercise metadata
The base exercise records also come from workout-guide, under the same licence. Everything layered on top of them is ours: the six-zone and eight-muscle mappings, the home and gym environment tags, the difficulty tiers, the default sets and reps, and the written coaching cue on each movement.
What is BackMaxx’s own
- Every word of prose on this site.
- The Back Score model, the six zones, the eight muscles and the nine-rank ladder on the Back Score page.
- The five focus programs.
- The zone mappings, environment tags, difficulty tiers, sets and reps, and coaching cues in the exercise library.
- The app icon, the app itself, and the app screenshots.
These are not CC BY-SA. See the terms for what reuse is permitted.
Why this page exists
CC BY-SA requires attribution that a reader can actually find, and it forbids us from claiming the art as ours. A credit buried in a JSON-LD block would satisfy a crawler and nobody else, so the credit also appears in visible text under the illustrations on every exercise page, and in the footer of every page on this site.
If you believe something here is credited incorrectly, please write to matcontact@tuta.io and we will correct it.
Frequently asked questions
Can I reuse the exercise illustrations from this site?
Yes, under CC BY-SA 4.0. You must credit Everkinetic and Bryl Lim’s workout-guide as the upstream sources, note that BackMaxx adapted them, and release your own adaptation under the same licence. You cannot relicense them or use them under more restrictive terms.
Did BackMaxx draw these illustrations?
No. They are adapted from Everkinetic’s open exercise art via the workout-guide project. BackMaxx selected a back-training subset and re-encoded the frames for the web; the drawings themselves are upstream work under CC BY-SA 4.0.
Is the exercise data open too?
The base records come from workout-guide under CC BY-SA 4.0. The layer BackMaxx added — zone and muscle mappings, environment tags, difficulty tiers, sets and reps, and the coaching cues — is our own work and is not CC-licensed.