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A side-by-side comparison of three different Instagram 9-post grid aesthetic previews displayed on white iPhone mockups for a fitness brand, the left phone shows a dark moody aesthetic with deep blacks and neon green accents, the center phone shows a bright minimal aesthetic with white backgrounds and clean lines, the right phone shows a bold colorful aesthetic with vibrant coral and electric blue, each phone displays a cohesive 3x3 grid of fitness content posts, clean white background with soft shadows beneath each device, UI showcase mockup photography, ultra realistic. Render in Clean UI showcase, device-frame mockup style.