It may sound paradoxical to say "take more exercise”, especially if you are experiencing a fast heart beat or find that your heart rate goes up with exertion. But the heart is worked by muscles like any other part of the body and the more efficient it is, the less work it has to do. Athletes typically find that because they exercise regularly, their resting heart rate comes down considerably from the norm.
For a healthy adult, the typical heart rate while at rest is around 60 to 80 beats per minute. Rates below 60 beats per minute are called bradycardia ("slow heartbeat”) and rates above 100 beats per minute are called tachycardia ("fast heart beat”). Athletes may have heart rates of 50, 40 or even 30 beats per minute because their heart muscles have become so efficient through exercise.
There are drugs that can slow your heart beat but these should be taken only when prescribed by a physician. However, there are also common foods and drinks that can increase your heart rate and you can avoid these. The most obvious is the caffeine that is present in tea, coffee and some soft drinks like Coke.
The classic method of reducing your heart rate naturally is through meditation. There are many different forms, originating from many of the world’s religious or philosophical traditions. Most of them involve sitting or lying quietly in a quiet space, away from the noise and bustle of everyday life, relaxing, breathing slowly, and emptying the mind of troublesome thoughts. The meditative trance is very much like the state just before you go to sleep and hence is very relaxing.