A YouTube thumbnail compares a man’s physique on Day 1 and Day 30 of a fitness challenge, with bold text

Prompt

A thumbnail for a “30-Day Fitness Challenge” results video. It’s a split-screen image showing the YouTuber’s physique on Day 1 and Day 30. The transformation is clear and impressive. The YouTuber is flexing in the Day 30 photo with a confident expression. The text “My INSANE 30-Day Transformation!” is in a bold, athletic font. This requires high subject consistency across images. –ar 16:9