You decide to ride your bike for 30 minutes, raising your heart rate to the middle of your target heart rate zone. What type of activity is this an example of?
A Aerobic, because it uses strong bursts of energy for a short duration
B Aerobic, because it uses oxygen for a long duration
C Anaerobic, because it uses oxygen for a long duration
D Anaerobic, because it uses strong bursts of energy for a short duration