A full body shot from a side view captures a 17-year-old Japanese high school girl performing a perfect Y-balance stretch in a school gymnasium. The girl, with a proud and triumphant expression, is balanced on her left leg while her right leg is extended vertically upward. She is wearing a white short-sleeved gym shirt with the hem left untucked over plain navy blue low-cut bloomers. Her hair is tied in a high ponytail that sways with her movement. Her right hand is gripping the toes of her raised right foot to maintain the pose, while her left arm is stretched high in the air in a confident, celebratory gesture. The setting is a spacious gymnasium with polished wooden floors reflecting the overhead lights and white walls with sports equipment in the background. The image is photorealistic and super-real, featuring smooth, glossy skin tones, expressive eyes, and clean linework. The lighting is bright and natural, casting soft shadows on the floor, with a clean and gentle color palette that emphasizes a crisp, athletic atmosphere.