Which Schwinn heart rate zone is primarily associated with developing aerobic endurance through fat as the dominant fuel source?
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A
Zone 1 – Recovery (50-60% HRmax)
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B
Zone 2 – Endurance (60-70% HRmax)
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C
Zone 4 – Threshold (80-90% HRmax)
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D
Zone 5 – Maximum (90-100% HRmax)