Laughing can be a great workout for your heart. When you laugh, the blood flow in your heart is increased for up to 45 minutes, which in turn improves your heart health.
Before each heartbeat, your heart fills with blood. Then its muscle contracts to squirt the blood along.
It takes less than 60 seconds to pump blood to every cell in your body.
The movement of the blood through the heart and around the body is called circulation.