“You and I have memories, longer than the road that stretches out ahead” is such a simple yet powerful lyric that captures how I feel about my relationship with my wife. Knowing we have more time in the past then what is left for us in the future is both amazing and daunting. Realizing how many great memories we made through those years. All of that captured in one line of one of their lesser songs. But, if they aren’t your cup of tea, that’s cool too.

Acid buildup in muscle tissue. Here is an article that explains what is happening:

https://www.pfizer.com/news/articles/science_fact_or_science_fiction_lactic_acid_buildup_causes_muscle_fatigue_and_soreness

Esit: I originally said that your.muscles are creating waste chemicals quicker than your bloodstream can handle causing those bad chemicals build up locally. While this is true in a broader sense, I think it is more nuanced that that. Reading the article should give a better explaination

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