Lucille has been told she needs to improve her heart health, and she is ready to get started. there are many activities she is considering for her new routine, but she knows she must first calculate her target heart rate zone. when is the best time for her to begin gathering data to do this calculation?
a. when she is resting
b. when she is working out
c. when she is at the gym
d. when she is finished working out

Life expectancy in the united states is (76.4 for men and 81.1 for women). life expectancy is not the same as healthy life expectancy. healthy life expectancy is the number of years a person is expected to live in this number is obtained by subtracting years spent in poor health from overall life expectancy. the world health organization (who) calculates healthy life expectancy in 194 countries. the united states ranks twenty-ninth in the world using this measurement, with an average of of healthy life expectancy. singapore ranks number one (76 years), and japan is number two (75 years).