Edit the reference image. Keep EVERYTHING identical: the same man (face, beard, hair, body, shorts, shoes), the same leg press machine, the same pose, the same background, lighting, camera and framing. Change ONLY this: the working leg muscles are highlighted like in an anatomical atlas: the thigh muscles of the legs (quadriceps on the front of the thigh, with the rest of the thigh muscle group) are shown as a semi-transparent red glow with clearly visible muscle fibres and a bright red muscle structure, in the style of a 3D anatomy render. The rest of the body stays normal skin with no highlight. No text, no logos, no watermark.
