why does an athlete or person in good physical condition has a lower resting heart rate than a person who is relatively unfit.
I ran a Google search using these terms:
athlete resting heart rate
(notice the correct spelling of athlete, or I wouldn't have gotten decent results)
Here are two of the websites at the top of the results list:
Athlete's Heart - Just like other muscles, the heart responds to ...
The most important muscle an athlete develops is her heart. Generally as she becomes more fit, her resting heart rate slows - a sign that her heart is ...
Heart rate - Wikipedia, the free encyclopedia
Resting heart rates can be significantly lower in athletes, and significantly higher in the obese. The body can increase the heart rate in response to a ...
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... and one to help you judge whether a particular website's information is worth your time: