Answer:
What makes me happy is getting to be more fit with my friends. My mood is usually excited and happy when I am there!
The body can no longer keep up with the demands placed on it
The heart rate is different while dancing, studying and riding a bike because the amount of blood needed for each activity is different. Blood pumps as fast as it as needed by the cells, which is why riding a bike has fast heart rate while studying has a regular heart rate.
