Ken's target heart rate is 122-139bpm. His resting heart rate is 73 bpm. What is his age?
To determine Ken's age, we need more information. The given heart rate values (122-139 bpm and 73 bpm) are related to target heart rate and resting heart rate, respectively, and do not directly provide Ken's age.
To calculate Ken's target heart rate range based on age, we can use the general formula: Maximum heart rate (HR max) = 220 - Age.
Since we don't have the specific target heart rate range for Ken's age, we cannot directly determine his age with the information provided.
Since this is not my area of expertise, I searched Google under the key words "optimal exercise heart rate formula" to get these possible sources:
http://www.google.com/search?client=safari&rls=en&q=optimal+exercise+heart+rate+formula&ie=UTF-8&oe=UTF-8
In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/.