Act as a professional logo designer with 10+ years of experience in fitness branding. Create a sleek, modern logo for an AI-powered fitness app named [APP_NAME]. The logo should embody [ENERGETIC/INNOVATIVE/MINIMALIST] vibes, using a color palette of [PRIMARY_COLOR], [SECONDARY_COLOR], and [ACCENT_COLOR]. Incorporate subtle tech-inspired elements (e.g., circuit lines, data dots) to highlight the AI aspect, while maintaining a strong fitness focus through abstract shapes like [DUMBBELLS/WAVES/MOTION_LINES]. Ensure scalability for app icons and merchandise. Include a versatile [WORDMARK/LETTERMARK/ICON] version. The style should appeal to [TARGET_AUDIENCE: e.g., millennials, athletes, or busy professionals]. Avoid clichés like heavy weights or obvious muscle silhouettes—aim for sophistication. Provide 3 stylistic variations in your proposal.