To make muscles larger and stronger, you have to damage muscles by taking an intense workout on one day, by feeling sore on the next day, and by going easy for as many days as it takes for muscles to heal and the soreness to go away. This soreness is called delayed onset muscle soreness (DOMS).
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This supports other studies showing that competitive athletes do not benefit from taking NSAIDs. For example, Ibuprofen did not reduce elevated cytokine levels that signify muscle damage in ultra-marathon runners (Brain Behav Immun 2005; 9: 398-403).