This document discusses managing training load for high-level athletes. It describes different stages of fatigue from acute fatigue to overtraining syndrome. A study examined the effects of functional overreaching versus acute fatigue strategies on performance. Subjects underwent an overload training period, taper period, and were tested on performance and physiological measures. The functional overreaching group showed greater short-term performance decrements but larger performance gains after tapering compared to the acute fatigue group. Monitoring multiple factors can help diagnose overtraining and optimize training programs.