Train one side of the upper body and you’ll keep the other strong.
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By the end of the study, published in the Journal of Applied Physiology, the people who stopped training lost 21.6 percent of their strength in the immobilized arm, while those who kept exercising the opposite arm lost only 2.4 percent. They were able to maintain muscle thanks to a neurophysiological phenomenon called cross-education, or mirroring.
But when people do single-arm exercises, information is sent between the two hemispheres via a metaphorical bridge called the corpus callosum, he says. This might explain why the left arm benefits when you train your right arm only.