To Improve Cardiorespiratory Endurance During Activities Such as Walking or Swimming

Multiple Choice

To improve cardiorespiratory endurance during activities such as walking or swimming slowly, your heart rate should be kept in the target zone for at least

A) 30 minutes, three times per week.
B) 10 minutes, five times per week.
C) 45 minutes, three times per week.
D) 15 minutes, four times per week.