. If a hardcore workout pushes your muscles beyond their usual comfort zone and you feel achy the next day, that’s not necessarily a bad thing. This is called delayed onset muscle soreness (DOMS, for short), and it means your muscles experienced tiny tears as they rose to the challenge you gave them during the workout. During the repair process that follows, they’ll become stronger.
With that kind of muscle soreness, which usually disappears within a few days, a light workout—a gentle walk, bike ride or swim followed by some stretching, for example—may actually ease some of the muscle tension and tenderness you feel; doing yoga can help, too. Sometimes putting sore muscles back into action actually helps them feel better because it enhances blood flow to the muscles, which can help with the repair process