DOMS (delayed onset muscle soreness) is caused by tiny microtears to the muscle from eccentric contraction (lengthening contraction). If you have limited range of motion from the pain, it is not wise to exercise again. Remember, tearing the muscle down is not the important part-rebuilding it is. In order to do that, you have to rest. So the most you should be doing is gentle walking in the case of extreme soreness, especially if you tried to exercise and noticed weakness. Walking helps to increase blood flow and therefore, increase healing due to nutrients in and increased circulation of metabolic waste out to rebuild. I know it is terrible to wait, but if you aren't making gains in your exercise because you aren't getting stronger from the rest period, you aren't doing anything anyway. Take care of those sore muscles, and they will eventually not get as sore as they adapt. Happy exercising (and resting).
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