When I run really hard, I definitely can feel it in the entire lower body -- mostly hamstrings/rear, but also quads and joints. Running engages your core, so that's working too, although I don't usually get sore there. If your shoulders are sore, then you were probably tensing up from all of the effort. When your primary muscles get really tired, then other muscles kick in to help and you are using everything you've got just to keep going forward.
Congratulations on your hard effort!! The soreness will pass, with recovery time, stretching and gentle exercise for a day or two. Make sure you have really good, well-fitting running shoes ... lack of cushioning or improper fit can make things worse than they otherwise would be.
Last edited by MBN; 02-17-2009 at 06:04 AM.
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