To benefit the cardiovascular system of young and middle-aged adults, endurance training must include
A. small-muscle activities performed 3 to 5 days per week
B. small-muscle activities performed 20 to 60 minutes per exercise session
C. large muscle activity with a HR intensity of 60-85 of maximum
D. large-muscle activities performed 1 day each week for 20 to 30 minutes
Question 2
Most authorities believe that individuals in their 70s and 80s who succeed in exercise performance such as the 10K road can attribute their success to
A. active lifestyles
B. large hearts
C. competition in athletics at a young age
D. retirement centers
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