Doing these fasted will lower your ability to sustain the higher work output in these. I’d suggest keeping you fasted workouts for the low intensity basic aerobic work.
@copilot67: The reason being, your heart rate won’t reflect your actual output in these workouts. Your heart rate should be in zone 1/2, but the load on your legs will be in 3/4. With that intensity, you definitely want to go into the workout fully fueled.
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