Repeated exercise, or wasting, can change the way key genes work.

Creatine is a natural source of energy that helps your skeletal muscles flex (contract). It helps create a steady supply of energy in your muscles so they can keep working, especially while you’re ...

While some organs, like the brain, work continuously, other body tissues, like muscle and fat, can enter an inactive state.

Building muscle after 50 is essential for feeling strong and healthy. While you’re perfecting your strength training routine and making sure to eat enough protein, you might wonder: How long does it ...

Building muscle isn’t as simple as just lifting heavy things and hoping for the best. Gaining muscle is not so much about what you do, but rather how you do it. The same exercise could be used to ...

Still dealing with a tight hip or weak glute—despite all the foam rolling, stretching, and strengthening? Or, maybe you’ve had an injury that keeps flaring up, even though you thought it was finally ...

Not taking enough rest days can mess with results, FYI.

Heimlich is a contributor for TIME. Heimlich is a contributor for TIME. A hard workout can come back to haunt you. When you wake up the next morning and try to get out of bed, everyday motions like ...

Bed exercises to flatten belly overhang after 55, from CSCS Jarrod Nobbe. Try 5 core moves that feel joint-friendly.