Question

20 which zone is considered the \aerobic\ zone for not only improving health, but also athletic conditioning by strengthening the cardiovascular and pulmo
a zone 1
b zone 2
c zone 3
d zone 4

Explanation:

In fitness and exercise physiology (related to Medicine and Health, a subfield of Natural Science), the aerobic zone for improving health and athletic conditioning (strengthening cardiovascular and pulmonary systems) is typically Zone 2. Zone 1 is very light, Zone 3 starts moving towards anaerobic, and Zone 4 is more anaerobic. So Zone 2 is the aerobic zone for these purposes.

Answer:

B. Zone 2