Lactic acid is nasty stuff. Your muscles produce it during intense exercise. It’s a metabolic byproduct that makes no contribution to exercise performance. It causes muscle fatigue and post-exercise ...

You’re racing against another person for 26 miles and as you approach the last quarter-mile, the two of you start to sprint as fast as you can. Your leg muscles start to burn, and they hurt so much ...

Lactic acid is a natural preservative often found in foods like yogurt, baked goods, and pickled vegetables. Along with making your food last longer, it can boost your health by strengthening your ...