Keeping up morale under what circumstances? In survival situations/emergencies? Or in daily life? People thus far are interpreting the question as pertaining to daily life.
Survival or not survival - morale is just a state of mind. So, in any situation such things as distraction, pleasure, and satisfaction will boost it. I don't see a need to go into specifics, as our minds are too different. One may go suicidal for a reason another considers a daily life chore.
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