What does rapid build-up of lactic acid in muscles mean?

Sasha

Senior Member (Voting Rights)
This is a question prompted by a comment by @Ryan31337 elsewhere.

There's a test for fitness that involves sitting and standing ten times and timing yourself. I thought I'd do it but after just five reps, my legs were so on fire with lactic acid I couldn't keep going.

What does that mean? Anything?

Is there a test I should be doing?
 
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