Promptkoi

Bold Gym Motivation Poster

Flux
By Varun Sharma Tested with Flux Flux.1 dev

Bold Gym Motivation Poster is a tested Flux Flux.1 dev prompt for poster work. It runs at Flux Flux.1 dev · Aspect ratio 2:3 · Steps 28 · CFG scale 3.5, and ships below with the exact prompt text, usage notes, and 2 pasteable variations.

Last tested: July 2026 with Flux Flux.1 dev

Part of the Flux prompt library.

Bold red-and-black gym poster template, a dumbbell silhouette with diagonal speed lines and an empty headline bar on top
Bold Gym Motivation Poster — Flux Flux.1 dev, Aspect ratio 2:3

Prompt 

A bold gym motivation poster template, portrait orientation, a large empty solid rectangular banner across the top left blank for your own headline, a strong flat dumbbell silhouette centered below, dynamic diagonal speed lines all sweeping in one direction, high-contrast red and black palette, flat vector graphic style, energetic fitness marketing template, no lettering

Settings

Model
Flux Flux.1 dev
Aspect ratio
2:3
Steps
28
CFG scale
3.5

How to use this prompt

The headline banner must stay a clean empty block. Describe it as an 'empty solid rectangle', never a 'text area' or 'headline text' — those phrases make Flux fill it with gibberish letters you'll have to paint out. Add your real slogan on top afterward. The dumbbell silhouette has to carry the poster alone, so keep it a bold flat shape, not a detailed 3D render that muddies the graphic look. Make every speed line sweep in the same diagonal direction; scattered lines read as noise instead of momentum. The hard red-on-black contrast is what makes it punch as a gym poster — resist adding a third color.

Variations to try

  • Kettlebell edition — swap the dumbbell for a kettlebell silhouette and use yellow-on-black
  • HIIT variant — replace the dumbbell with a sprinting figure or battle ropes for a cardio-class poster
bold flat design poster marketing

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For developers — copy this prompt as JSON 
{
  "title": "Bold Gym Motivation Poster",
  "prompt": "A bold gym motivation poster template, portrait orientation, a large empty solid rectangular banner across the top left blank for your own headline, a strong flat dumbbell silhouette centered below, dynamic diagonal speed lines all sweeping in one direction, high-contrast red and black palette, flat vector graphic style, energetic fitness marketing template, no lettering",
  "model": "Flux",
  "model_version": "Flux.1 dev",
  "settings": {
    "aspect_ratio": "2:3",
    "steps": 28,
    "cfg": 3.5
  },
  "style_tags": [
    "bold",
    "flat-design"
  ],
  "use_case_tags": [
    "poster",
    "marketing"
  ],
  "source_url": "https://promptkoi.com/prompts/flux/bold-gym-motivation-poster/"
}

The whole library is available as an open JSON dataset · developer docs.