# Detailed Calculation of the Exertion Score

Average Heart Rate - Average heart rate is calculated by creating HR readings over the number of seconds that the watch captures that HR for. It is then summed together and divided by the total number of minutes to capture that time frames HR average.

Weighted Buckets

29% 0.25

30% 0.5

40% 0.75

50% 1

60% 2

70% 2.5

80% 3

90% 3.5

100% 5

7-Day Standard Deviation: Take the standard deviation of the previous 7 daily averages (this is will be the standard deviation of the persons daily average HR over the previous days).