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So you haven't worked out in a while, and since you did you've been really sore huh? That's normal, it should hurt a bit. Make sure that you work through the pain though, and not take a week long break until you exercise again.
What happens to some is that they will not have exercised for a while and then go hit the gym and get really sore. Instead of exercising the next day or day after, they wait until the soreness leaves completely, generally just waiting until the next week. Just try and not fall into the pattern here, but work through the pain. Gives yourself a day to rest, but work through the pain! It will not happen for the rest of your exercising career, do not fret. Push through and you'll be glad you did.