The document discusses a wireless sensor system called Motion that tracks and analyzes body movement in real-time to improve athletic performance and prevent injuries. The system uses small sensors with accelerometers and gyroscopes that attach to the body and sync with a mobile phone app. The sensors would cost around $30 each to produce. The system aims to provide advanced motion analysis capabilities to consumers at lower prices than existing professional-grade systems. It could be marketed to hobby athletes, fitness coaches, and gyms to allow remote coaching and comparison of form against experts. Challenges include the technology required for accurate motion tracking, creating easy-to-use analytics, and determining the best pricing and marketing strategies.