Coaches and personal trainers tell athletes and exercisers that they have to
learn to work out at just below their "lactic threshold," that point of
diminishing returns when lactic acid starts to accumulate. But that, it turns
out, is all wrong. Lactic acid is actually a fuel, not a caustic waste product.
Muscles make it deliberately, producing it from glucose, and they burn it to
obtain energy. The reason trained athletes can perform so hard and so long is
because their intense training causes their muscles to adapt so they more
readily and efficiently absorb lactic acid.
I read this article about a year ago and everytime I go to the gym, I hear how evil lactic acid is... Geez people: lesson numero uno, you must read the ny times!
http://www.nytimes.com/2006/05/16/health/nutrition/16run.html?ex=1178769600&en=1de60252983bbf6e&ei=5070
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