Donna Is a 70-Year-Old Retired Physical Education Professor

Donna is a 70-year-old retired physical education professor.She has been physically active all of her life,but over the last year,she has been busy traveling and has not been exercising at all except for her walking tours around international cities.Donna enjoys all types of physical activities,especially walking,weight lifting,rowing,hiking,racquetball,and tennis.Donna would like to get started on a regular routine of exercise.Answer the following questions to help her develop an appropriate fitness plan.
-Donna would like to know what the current guidelines are for monitoring your heart rate during exercise.Now that she is 70 years old,what is her estimated MHR?

A) 120 bpm
B) 130 bpm
C) 140 bpm
D) 150 bpm
E) 160 bpm