How Does Causes of Muscle Soreness - Coursera Science of Exercise Work?

Muscle soreness happens when your muscles work harder than they're used to, like when you try to run a race after being sedentary all week.

Muscles are like little engines in your body. When you exercise, especially something new or intense, these engines get tired and stressed. This stress causes tiny tears in the muscle fibers, imagine tearing a piece of playdough when you stretch it too far. These little tears make your muscles sore.

When your muscles are working hard, they need more energy to keep going. They get this energy from something called glucose, which is like the sugar in your blood. If you don’t have enough glucose, your muscles might feel like they’re burning, kind of like when you're playing a game and run out of juice.

Your body is smart! When those tiny tears happen, your body sends repair teams to fix them. These repair teams are like little builders who come in the night while you sleep and rebuild your muscles so they get stronger, just like how a broken toy gets fixed and becomes even better than before. Muscle soreness happens when your muscles work harder than they're used to, like when you try to run a race after being sedentary all week.

Muscles are like little engines in your body. When you exercise, especially something new or intense, these engines get tired and stressed. This stress causes tiny tears in the muscle fibers, imagine tearing a piece of playdough when you stretch it too far. These little tears make your muscles sore.