Jet lag advice fixates on light and melatonin while skipping a legitimate clock-shifter: exercise — movement at the right local time nudges circadian rhythms measurably, and the arrival-day walk doubles as the best sightseeing decision anyway. The exercise protocol for time-zone repair.

The Evidence Angle

Exercise shifts body clocks: studies show workout timing nudges circadian phase (movement is a zeitgeber — a clock cue — alongside light and meals). It won’t out-shift light, but stacked WITH it, the combination compresses the adjustment days.

The Arrival-Day Protocol

The golden move: outdoor movement at LOCAL morning or midday — the arrival walk (light plus exercise plus staying-awake-till-local-bedtime, the trifecta in one stroll). The nap temptation loses to the walk; the walk delivers the sights the nap would have slept through.

The Direction Adjustments

Eastward travel (the hard direction): morning local exercise and light, evening workouts avoided (they push the clock the wrong way). Westward: the forgiving direction — afternoon-evening activity helps extend the day. The gym session’s timing is now a navigation instrument.

The First-Days Realism

Performance expectations travel-adjusted: the first-days workout runs at reduced intensity (the body is running internal renovations — Zone 2 beats intervals mid-shift), hydration doubled post-flight, and the hotel-room routine or walking tours as the format (the travel-workout guide’s menu applies). By day three the clock and the training calendar re-sync — faster than the sedentary version by a day or more.

Walk on arrival, morning movement eastward, easy intensity till day three. Jet lag was a clock problem with three dials — and exercise was the dial the guides kept leaving unturned.