A 3D mobile app icon for a running and fitness app. The central element is a futuristic, chunky "dad shoe" sneaker caught in mid-stride, pressing down onto a stylized ground surface. Use a "Hyper-3D" artistic style with exaggerated proportions. The sneaker should be a vibrant mix of "Volt Green" and "Deep Charcoal" with reflective metallic accents. Add small "motion trails" or "wind wisps" behind the heel to indicate speed. The lighting should be high-contrast "rim lighting" to make the silhouette pop. Material textures should include breathable mesh and a translucent "air bubble" sole. Set against a dark, minimalist squircle background to make the neon colors glow. 8k, Octane Render, trending on ArtStation, sporty and high-energy.