HMS, BM EQ-Bank 5 MC A marathon runner is competing in a 42.2km event. What is the likely duration their body will predominantly use the aerobic energy system? 90 seconds 10 minutes 60 minutes 180 minutes Show Answers Only \(D\) Show Worked Solution Aerobic system is dominant for activities lasting longer than 3 minutes Marathon running is a prolonged endurance event typically lasting 2-4 hours Aerobic energy system only system capable of sustaining continuous energy production for several hours Uses oxygen to break down fuel sources efficiently for extended performance \(\Rightarrow D\)