The Gym Progress Selfie prompt produces that workout shot in the mirror, the format that engages the fitness crowd and shows how far you have come. It works in NanoBanana, in Gemini and in ChatGPT.
1) Send your photo (and the product or outfit one, if you like) with the JSON prompt in the same message.
2) Keep "preserve_identity" so the face comes out faithful to yours.
3) Adjust the pose in "person.pose": mirror selfie with the phone covering part of the face, standing or flexing.
4) Set the room in "setting" with mirrors, equipment and the fluorescent gym light.
5) Generate and redo it, changing the crop in "framing" until it feels like a spontaneous photo.
Tip: leaving the light "imperfect" avoids the studio look and makes everything more believable.
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