Fig 1.
Integration of GPS and step-count data.
Fig 2.
A fictitious web interface of the (re)design recommender system.
The image is for illustrative purposes and was generated using ChatGPT 5.4 based on author-defined prompts and subsequent editing to reflect plausible real-world conditions. Fig 2 includes icons and hypothetical street-level images generated using ChatGPT 5.4. In accordance with the OpenAI Terms of Use (https://openai.com/policies/terms-of-use/), the authors retain ownership of the generated icons and images.