Websites

[|Polar Tutorial]

[|District 16] [|time-distance-pace calculator]

http://www.topendsports.com/testing/tests/20mshuttle.htm

http://www.marathonguide.com/fitnesscalcs/HeartRate2calc.cfm This one uses your resting heart rate as a factor.

http://www.marathonguide.com/fitnesscalcs/HeartRate1calc.cfm Basic Heart Rate Calculator