There is the collective joy our species is hardwired to feel when we move in synchrony with others, a phenomenon that at first was an evolutionary advantage that promoted cooperation during hunting. There is the release of neurochemicals such as endorphins and oxytocin, which promote affection and bonding. There is the ritualistic nature intrinsic to many exercise programs, leading to a sensation scientists call identity fusion—feeling connected to and part of something larger than oneself. And there is the shared confidence, vulnerability, and trust that emerges from undertaking physical
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