At the campus gym, Sophia noticed many classmates suffered sports injuries due to improper form. She developed an AI fitness coach app that uses pose estimation algorithms to capture joint deviations in real-time and provides voice and graphical correction suggestions through a mobile app. To improve model robustness, she collected thousands of action data sets under different heights and lighting conditions and invited teammates to participate in beta testing. Test results showed that participants' movement accuracy improved by an average of 20%. Sophia used technology to protect health and added significant value to her UMich application.