WHY THIS HAPPENS
Circadian disruption from time-zone shifts — HR and RPE stay elevated for days
Dehydration from flying — pressurised cabins cost ~200ml/hour
Sleep debt compounded across consecutive travel days
Meal-timing chaos — late dinners, skipped breakfasts, disrupted fuelling patterns
Stress cortisol from travel logistics adds to training stress
Inactivity during travel — sitting in airports and cars increases stiffness, reduces blood flow
The urge to 'catch up' with a hard ride day one — exactly the wrong move