Animate this original artwork as a refined five-second website hero media asset. The same adult athlete runs naturally in place in the same right-facing profile framing, completing a restrained running stride cycle. Arms and legs alternate anatomically, ponytail swings and faint green trails and dust flow backward. Preserve face, body proportions, clothes and shoe count. Preserve original identities, proportions, palette and materials. Locked camera unless explicitly specified. No zoom, cuts, text, UI, new objects or distorted anatomy. Continuous restrained motion; begin and end near the same composition where physically plausible.