One of my weaknesses in cycling is low resistance, high cadence spinning. I find my legs fatigue quickly and it just doesn't feel efficient. So this year I have been adding some of these intervals into my training. However, I don't really know why.
Anyways, I was talking to my coach about it and saying that I don't if I will race that way, spinning in my smaller front ring, but just faster on race day. I prefer spinning in the bigger ring for the reasons I stated above. My coach's response was this: "you should race in the lower gear because your legs will be fresher for the run."
Can someone please explain why I should be doing this from a theoretical point of view, because to me it just doesn't feel good, I feel like I am expending too much energy and it is too tiring. I don't mind doing it in training, but not sure about doing it on race day.