For a subtle yet impactful animation of the smartphone interface, consider a soft pulsating effect on the "Workout plan" section, suggesting activity and engagement. The leaderboard rankings could smoothly transition with gentle upward scrolling, highlighting user achievements in a dynamic manner. Additionally, the chat icons can exhibit a light shimmer or glow effect, drawing attention and enhancing the social aspect of the app, all while maintaining a calming rhythm that aligns with the pastel tones of the artwork.

For a subtle yet impactful animation of the smartphone interface, consider a soft pulsating effect on the "Workout plan" section, suggesting activity and engagement. The leaderboard rankings could smoothly transition with gentle upward scrolling, highlighting user achievements in a dynamic manner. Additionally, the chat icons can exhibit a light shimmer or glow effect, drawing attention and enhancing the social aspect of the app, all while maintaining a calming rhythm that aligns with the pastel tones of the artwork.