健身镜自拍，带身份锁定和动态姿势

Use the uploaded reference image as a strict identity anchor and preserve the person’s face, facial proportions, skin texture, and hair 100% exactly with no alteration, beautification, or reinterpretation. Ultra-photorealistic gym mirror/selfie style image showing a rear three-quarter back view of the same woman in a modern gym. She is dynamically posing with one leg raised high backward in a natural flexibility stretch or playful kick, looking back over her right shoulder with a subtle, confident smile. One hand casually holds black fingerless weightlifting gloves, posture relaxed and athletic, emphasizing a toned, fit physique without exaggeration. She wears a black fitted long-sleeve crop top with thumb holes and a small white heart logo on the sleeve, high-waisted short gray seamless athletic shorts with a small white activewear logo centered on the back waistband, and white athletic sneakers with black accents. Hair is pulled into a high ponytail with a few loose strands, skin realistic with natural highlights. Environment is a clean modern gym with rubberized flooring, dim cool overhead fluorescent lighting, red plyometric boxes, a black punching bag, and gym equipment softly visible in the background. Lighting is moody and realistic, creating soft shadows and subtle highlights on skin and fabric. Smartphone-realistic candid fitness photography, sharp focus on the subject, natural motion feel, high detail textures. Negative prompt: face or hair changes, frontal view, extra limbs, distortion, beauty filters, plastic skin, cartoon/anime, blur, text, watermark, extra people, cluttered focus.