Training provides a signal; recovery is where your body has the chance to respond. A rest day is not proof that a plan has stopped—it is one of the ways a plan becomes sustainable.
Recovery is more than soreness
Readiness reflects sleep, food intake, work and family stress, recent illness, and the amount and novelty of training. Persistent performance decline, unusual fatigue, disturbed sleep, mood change, or repeated illness can signal that the total load is too high.[1] These symptoms can also have medical causes and should not be self-diagnosed as overtraining.
Sleep is part of the programme
A review of athlete sleep practices describes sleep as important for physical and cognitive recovery while noting that travel, training schedules, stress, and competition can disrupt it.[2] A wearable score can be one clue, but it should not overrule how you feel or become a diagnosis.
Choose complete rest or active recovery
A recovery day may be complete rest or easy movement such as walking, relaxed cycling, or gentle mobility. Keep active recovery easy enough that it does not become another hard workout. If symptoms improve only when training stops and return as soon as it resumes, seek qualified assessment.
The purpose of recovery is not to earn the next hard session. It is to make an appropriate next session possible.
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Sources and further reading
1. Kreher and Schwartz, Overtraining Syndrome: A Practical Guide — Clinical review of overreaching and overtraining.
2. Walsh et al., Sleep and the athlete — Review and expert recommendations on athlete sleep.
3. UCLA Health, How often should you take a rest day? — General recovery-day guidance.