Deep burn in my muscles aagain after years

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So the last week that Ive been training Ive been getting that deep burning feeling in my muscles as I train them. I dont mean DOMS or soreness or stiffness the day after, I mean that burning sensation while you train.

I havnt felt this in ages, since around the time I first started training. I dont mind it at all (actually like it in a way lol), but Im just curious as to why this is happening all of a sudden lately. Anybody got any explanations or ideas? Thanks

[J431S]

sound like athritis...don't my word though, check with your doc first for accurate diagnostic info

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sound like athritis...don't my word though, check with your doc first for accurate diagnostic info

But im only 23.... Its not like aching joints or bones or anything

[Angel of death]

What youre talking about is the buildup of lactic acid in your muscles I believe. I think it is a good thing that you are getting it.