An increasing number of people play sports such as tennis or baseball. Where more training can help to increase a player’s overall performance, it also increases the risk for injury. Currently, movement can be captured by marking the bony landmarks of a player and subsequently capturing the player’s movement with cameras from different kinds of angles. Although these measurements are very accurate, the set-up has to be very precise and is very time consuming. Hence, not ideal in a sports training setting. The researchers aim to develop a special shirt or sleeve that can measure the performance of tennis and baseball players. By equipping a shirt with special sensors that can measure the acceleration and angular velocity of a pitcher they develop a new method for capturing body motion. By combining the motion data of players with questionnaires over time in which users report their physical condition and injuries the researchers want to develop a feedback mechanism that can help both player and trainer to find the balance between enhancing performance and reducing injury risk.