What stressors could contribute to toughening in humans? Research on toughening regimes is still in its infancy, but a few types of stressors nonetheless crop up in the literature. The most important, not surprisingly, is exercise. Humans are built to move, so move we should. The more research emerges on physical exercise, the more we find that its benefits extend far beyond our muscles and cardiovascular systems. Exercise expands the productive capacity of our amine-producing cells, helping to inoculate us against anxiety, stress, depression and learned helplessness. It also floods our brains
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