A medium shot, side view anime illustration of an original female character, Rinka, jogging on a treadmill in a gym. Rinka is a tall 175cm woman with raven-black hair reaching her thighs and messy bangs at eyebrow level, featuring sharp, upturned black eyes and a determined expression. She possesses an extreme hourglass figure with massive, firm K-cup breasts, a narrow 56cm waist with subtle abdominal definition, and wide hips with thick, voluptuous thighs. She is dressed in tight black athletic training wear that clings to her curves, emphasizing her voluminous bust and muscular legs as she runs. Her arms are pumping in a running motion, with hands loosely clenched into fists. The background is a modern gym environment with various workout equipment and mirrors, softly blurred. Bright, clean overhead lighting creates high contrast, highlighting the glossy texture of her athletic gear and the sheen of sweat on her skin, conveying a healthy and energetic atmosphere.