From DW Documentary.

Muscles can do much more than just set our bodies in motion: regular muscle training has a positive impact on our overall health. This is because muscles work in a similar way to an endocrine organ: when activated, muscles release messenger substances called myokines, which directly influence our central organs such as the brain, liver, heart and intestines. If we lose muscle mass, these organs can become diseased, or metabolic disorders like diabetes can develop. Increased strength and muscle mass have been linked to better mental health, increased focus, improved sleep, and stronger immunity.

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