Americans research training for this particular muscle group in overwhelming numbers.

Ready to hear something surprising (and pretty depressing)? According to scientific research, the body starts to lose muscle as early as our 30s, with a gradual decline of between 3 and 8% per decade.

This is a big deal. For years, many people believed that aging always causes muscle weakness. But this study shows that the nervous system—the system that sends signals from the brain to the ...