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.
Increased pressure to eat healthy and cut down portion sizes
Reduced pressure to exercise regularly within the target heart rate zone
You usually gain a little weight during taking it, but its not a lot of weight!