This project presents the development of ArmAlert, a smart arm sleeve designed to monitor muscle activity, movement, and physiological strain in real-time, with a focus on optimizing athletic performance and reducing injury risk. Tailored initially for baseball players, the sleeve integrates an array of sensors to track metrics such as muscle fatigue, velocity of throws, and Temperature, addressing the rising incidence of elbow injuries, particularly ulnar collateral ligament tears, driven by increased fastball velocities exceeding 95 mph in Major League Baseball. The device wirelessly transmits data to a mobile application, providing personalized feedback and recovery recommendations. Constructed from lightweight synthetic materials, ArmAlert ensures comfort and accuracy during use. While the short-term goal is to minimize injuries and enhance recovery for baseball players, the system’s adaptable sensor framework and software architecture support future expansion to other sports and rehabilitation applications. By combining wearable sensor technology with real-time analytics, ArmAlert empowers athletes and individuals to make data-driven decisions for improved performance, recovery, and overall physical health.