Humans are intensely social creatures, and more than any other species we cooperate with unrelated strangers. We used to hunt and gather together, and we still share food, shelter, and other resources, we help raise one another’s children, we fight together, we play together. As a result, we have been selected to enjoy doing activities in groups, to assist one another, and to care what others think of us.15 Physical activities like exercise are no exception. When we struggle with fatigue or lack of skill, we encourage and help one another. When we succeed, we praise each other. And when we
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