The woman begins exactly in the position shown in the reference image. Preserve her exact facial identity, facial structure, eye shape and size, nose, lips, jawline, body proportions, skin tone, denim-blue hair color, high ponytail, light-blue sports top, black leggings and overall appearance throughout the entire video. She slowly releases the overhead triceps stretch and naturally lowers both arms to her sides. She briefly stands upright and relaxed. She then smoothly shifts her weight onto one leg. Keeping her upper body upright and stable, she slowly bends the opposite knee backward, bringing her heel naturally toward her glute. She gently reaches back with the hand on the same side and holds her ankle, entering a comfortable standing quadriceps stretch. The transition is slow, controlled and natural. She does not rush or exaggerate the movement. Her standing leg remains slightly relaxed rather than completely locked. Her head and face remain almost completely stable throughout the movement. She looks focused and relaxed, gazing naturally just past the camera without direct eye contact. Her facial expression stays nearly unchanged, with one subtle blink and natural breathing. Once she reaches the quadriceps stretch, she calmly holds the position for the remainder of the clip. Her body makes only tiny realistic balance adjustments. Keep the exact same outdoor location, lighting, camera position, framing and background from the reference image. Her ponytail and a few loose strands move only slightly in the breeze. Fixed camera, no zoom. Maximum facial identity consistency and anatomically correct leg movement are the priorities. No facial morphing, no identity change, no face reshaping, no change in eye size or spacing, no head turning, no body proportion changes, no breast size change, no leg deformation, no extra legs or arms, no twisted knee, no reversed foot, no ankle deformation, no extra fingers, no unnatural balance, no sudden movement, no changing clothes, hair or background. Photorealistic, subtle, slow and natural human stretching.