why does an athlete or person in good physical condition has a lower resting heart rate than a person who is relatively unfit.

Question

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 ...
http://www.sportsdoctor.com/articles/heart.html

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 ...
http://en.wikipedia.org/wiki/Heart_rate

Learning to use Google or other search engines can save you time and help you learn to find information efficiently. Here are some websites that can teach you how:

http://www.lib.berkeley.edu/TeachingLib/Guides/Internet/FindInfo.html

http://www.sou.edu/library/searchtools/searchtips.html

http://www.pandia.com/goalgetter/index.html

http://websearch.about.com/mbody.htm?once=true&COB=home&PM=112_100_T

... and one to help you judge whether a particular website's information is worth your time:

http://www.sou.edu/library/searchtools/evaluate.html

=)