Overreaching

Is Overreaching necesarry for improvening performance?Or is enough more Intensity?
How to measure (with tests) Overreaching?

In phase Loading(1 or 2 or max 3 weeks) if performance falls below 85% for more that 1 or 2 workouts to do Unload(for 1 or 2 week)…is correct?
Instead if you are capable of setting personal records ,you not Loading hard enough…

are ypu referring to the biomechanical term pf over reaching

Overreaching is great until you get injured.