What does it mean when I have sore ribs and upper chest, after shoveling snow?

i already know im out of shape. thats a big part of my life that i don't really need to explain but, this is the sort of pain that doesn't just feel like im out of shape kind of pain, im just wondering if i may have done something to those areas?
What does it mean when I have sore ribs and upper chest, after shoveling snow?
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