Working out and making music at the same time – scientists at the Max Planck Institute for Human Cognitive and Brain Sciences in Leipzig retrofitted conventional fitness machines to produce music during a workout. Not only do these "jymmin" machines reduce physical exertion during exercise. The researchers have now proven that they also have a mood-enhancing effect: After strength training with musical feedback, a person's mood improves significantly. It appears that hormones are responsible for this beneficial effect on mood.
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