How do you stay consistent with wellness habits when you travel a lot?

Reduce the habit to its portable core rather than trying to recreate the full version. Walking, bodyweight movement and breathing work travel anywhere. Sleep is usually the thing that suffers most, so protecting the wake time and getting morning light in the new location does more than any other single action, especially across time zones. Food is easier if you decide in advance rather than at the moment of hunger. And accept a maintenance standard while travelling — the goal is not progress, it is arriving home without having to restart from zero.