Lactic acid is partially responsible for the pain or burning you feel during your workout, but it has nothing to do with the muscle soreness you’re feeling a day or two later. Since muscle ...

Muscle soreness can make you feel like you conquered ... Those movements cause more damage to your muscles than others. Lactic acid build-up likely causes DOMS. Your muscles produce lactic acid ...

It's not lactic acid (that's a myth), but rather a phenomenon known as DOMS, for "delayed onset muscle soreness." It's most likely to happen when you do something different than what you're used to.

Usually nothing to worry about, lactic acid is produced as a result of anaerobic ... potential cramping and even visible shaking of the muscle. Once you rest and recover, symptoms should begin ...

So you'd see an athlete stop, they would pull up suddenly, they would start to rub the muscles and they would sometimes appear to be in some sort of pain. When you run fast lactic acid builds up ...