On September 13, 2023, the individual focused on several tasks including reviewing coding problems, specifically completing the "141.环形链表" and planning to tackle "142.环形链表-ii" and "160.相交链表". They also dealt with issues related to the react-noiton-x library, which is used in their blog's search interface, and attempted to compile the library from source code due to outdated versions. Challenges included issues with yarn proxy settings, understanding workspace concepts, and the process of npm publishing. Additionally, they worked on their blog, integrating Sentry for error tracking and adjusting the giscus comment section's style to better fit different themes. On the personal front, they skipped the gym due to poor physical condition but exercised at home using an elliptical machine. They also considered upgrading their smartwatch as it was no longer compatible with the latest watch face market updates.