Use the attached photo as the reference for the person. Keep her face, facial features, skin tone, hair, body type and identity exactly as shown, with no retouching that changes who she is. If no photo is attached, use the Subject described below.
Show the Subject walking on a treadmill while taking a phone selfie, with her reflection clearly visible in the gym mirror behind her. Place her in the Gym Setting and dress her in the Workout Outfit. Include the Phone naturally in her hand, with the phone partly covering the face as it would in a genuine mirror selfie. Frame the scene vertically from a natural standing perspective, showing the treadmill console, her full upper body and enough of the gym to establish the setting. Use realistic indoor gym lighting, accurate mirror reflections, natural skin texture and believable proportions. Keep the image candid and lightly active rather than posed, with subtle background depth and a documentary lifestyle photography feel. Render the result in the Format.
Use these details:
Subject: "woman in her early 20s"
Workout Outfit: "black fitted tank top, charcoal leggings and white trainers"
Gym Setting: "bright modern gym with a mirrored wall and rows of treadmills"
Phone: "black smartphone"
Format: "4:5 portrait"
Using your own logo, product or face? Attach it in the chat and say which of the details it replaces.
Your result will come out close to the example rather than identical to it. Change the details to make it yours.