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?
Pyruvate mentioned once more and it does seem an important part in the puzzle https://www.hindawi.com/journals/jar/2016/2497348/
