Linking a specific training regime to a specific performance outcome is tricky. The impact of various training techniques can interfere with one another, making it almost impossible to see the real effects of a single method. Nowadays, it is easier to closely monitor training: power meters, GPS trackers, data loggers, and so on have made the work faster. But these tools only tell you how training was carried out, and not what adaptation it has triggered. Start comparing the documented training (input) with a complete picture of your athletes’ performances (output). INSCYD enables you to break down the overall performanceof your athlete into individual components. Monitoring and assessing each metric separately will allow you to understand precisely which adaptation the prescribed training triggered.