A 92-year-old woman, Li, from Hunan, China, is proving that age is just a number when it comes to fitness. Her intense morning regimen features 200 push-ups, 100 sit-ups, and even hula-hoop spins.

Here's what you need to know—and how to get started, according to an expert.

New study finds this low-impact workout can boost lean muscle and reduce waist size in just 12 weeks. There are countless forms of exercise that promise to shrink your waistline and help you build ...