For years, women were told to train differently because of their hormones. New research suggests the fundamentals of building strength and muscle look remarkably similar across sexes.

Deep sleep does far more than rest the body — it activates a powerful brain-driven system that controls growth hormone, fueling muscle and bone strength, metabolism, and even mental performance.

Researchers have identified the brain circuitry that links deep sleep with the release of growth hormone, revealing how the two regulate each other. The newly discovered feedback loop helps explain ...

Experts break down the science behind muscle growth.