A new study shows male zebra finches must sing every day to keep their vocal muscles in shape. Females prefer the songs of males that did their daily vocal workout. Why do songbirds sing so much? Well ...

Muscle mommies challenge the stereotype that motherhood and fitness can't coexist. These powerhouse women lift heavy, eat ...

Aging, nutrition and lifestyle affect muscles, especially after age 40. That's why Matt Ryan, former professional quarterback ...