There's no blood test or body signal that reliably shows when someone is overtrained — the best way to tell is by how long it takes their performance to bounce back.

There's no single blood test or clear sign that doctors can use to diagnose overtraining. Instead, they rely on a mix of how you feel (like mood and fatigue) and lab tests (like hormones and inflammation), but none of these are very accurate on their own.

There's no single blood test or clear sign that can definitively tell if someone has overtraining syndrome. Doctors instead use a mix of mood surveys and lab tests like cortisol or testosterone, but none of these are very accurate on their own.

Nine simple check-ins about mood, eating, and how you're feeling during workouts can tell if a male athlete is overtrained — no blood tests or fancy machines needed.