Why Does Exercise Make You Happy?

When you move your body, it sends happy signals to your brain. Think of your brain as a big city and your nerves like mail carriers. When you run or play, these carriers bring letters called happy chemicals. These letters tell the city council that everything is fine.

Your body gets warm and wiggly. This warmth makes special oils inside you float up to your head. These oils feel like a cozy hug for your brain. That is why you smile after playing tag or riding a bike.

Scientists found that when mice run on their wheels, they act happier too. They do not want to leave the wheel! Humans are just bigger mice with better shoes. So next time you feel grumpy, go for a walk and let your happy oils do the work.