Athletes are regularly confronted with setbacks, such as losses or injuries. To successfully overcome these stressors, they need to be “resilient”. But what does resilience actually mean and how can the process of overcoming stressors be studied? In this dissertation, we present a new perspective that enables researchers to study resilience and develop techniques to predict when a person is losing resilience. This bears important practical implications because a loss of resilience may lead to drastic negative changes in performance. For instance, variations in performance may signal whether a person is about to lose resilience and enter a worse performance state. On the other hand, we also found that stressors do not necessarily provoke neg...