The beginning of a workout is often the easiest part. After slipping on your best activewear and loading up an energizing playlist, you may feel invincible when you start your exercise routine. But ...

Muscle cells' "power stations" function less effectively in people with long COVID, potentially explaining the persistent fatigue that's a hallmark of the condition. That's the finding of a Dutch ...

Lactic acid, produced in the muscles from intense exercise, enhances performance rather than reduces it as commonly believed, according to a new study. A team of Australian and Danish researchers ...

Aug. 23 -- When U.S. swimmer Natalie Coughlin reached the final 15 meters of the 100-meter backstroke competition in Athens, she felt her body scream. "That last 50 hurt a lot," she said, after ...

Have you ever had one of those days when your muscles feel heavy, and you’re just too tired to work out? Well, don’t worry; all athletes feel that way once in a while. Now, the question is will you ...

High cholesterol describes a waxy substance found in your blood. What’s worse, too much of this fatty culprit can lay the groundwork for serious health problems like heart disease and strokes without ...

You’ve been at the New York State Fair for hours. You’re getting cranky because you’re tired and sore. A good place to get relief and buy products that can soothe your aching feel and muscles is the ...

Fatigue occurs when muscles become weaker with repeated or intense exercise, or as a result of an illness. Researchers have long thought that fatigue is caused by a build-up of lactic acid in the ...