Flat 2.0 Fitness Mobile App Design Prompt

Build a modern fitness mobile app in a Flat 2.0 design style that combines clean flat interfaces with subtle depth, soft shadows, gentle layering, and clear visual hierarchy. Create an energetic yet minimal experience featuring a personalized home dashboard, daily activity rings, step and calorie tracking, workout plans, exercise library, workout player, progress charts, goals, streaks, achievements, nutrition tracking, and user profile. Use bold flat colors, rounded cards, crisp typography, simple geometric icons, spacious layouts, subtle elevation, lightly raised buttons, restrained gradients, smooth micro-interactions, animated progress indicators, and intuitive bottom navigation. Keep the interface uncluttered, highly accessible, responsive, motivating, and polished, with depth used only to distinguish interactive elements and content layers without losing the simplicity of classic flat design.