Minimalist app icon logo for a modern fitness-tech / wearable / social competition brand named “NEX”. Create a custom monogram mark based on the letter “N”, but do not make it look like a generic font. The N should feel like movement, discipline, execution, progress, and self-improvement. Integrate a subtle upward / forward arrow into the right stroke or diagonal structure of the N, symbolizing “Next Move”, “No EXcuses”, growth, challenge, and becoming the next version of yourself. The design should be clean, sharp, bold, and highly readable at small app-icon size. Use a dark rounded-square app icon background, deep graphite / near-black with a premium tech feel. Main N shape should be white or light grey. The arrow / motion accent should use a blue-emerald / teal color, not purple. Flat vector style, minimal geometry, strong negative space, balanced proportions. No full wordmark, no extra text, no mascots, no people, no dumbbells, no lightning, no flames, no complex symbols, no gradients, no 3D, no mockup, no shadows, no texture. Professional startup fitness app icon, clean and scalable.