““Exercising an unfit muscle causes soreness, which is followed by improved muscle function and increased resistance of that muscle to become sore. In that sense, soreness after exercise is good (as long as it lasts less than a week and doesn’t come back). Sore joints, on the other hand, are collateral damage (see above). Most people think that if they do an intense workout (say 90 minutes of circuit training in a gym) that they should lose weight. And indeed, if you weigh before and right after such a workout, the scale goes down because of sweating and water weight loss. However, if it makes you sore for the next few days don’t be surprised to see the scale go up. That’s because muscle soreness indicates that your muscles are temporarily inflamed, and inflammation causes fluid retention and swelling in that muscle. Once again, don’t let the scale make you crazy. Once the soreness is gone, the swelling is gone, and the scale comes back down where it’s supposed to be.””
