Whenever I run tempos or cruise intervals, I feel good. I feel strong and in control.
Whenever I run 200s @ 400-800m pace, I feel in control, I feel strong, and fast.
Whenever I run 3k-5k intervals, I feel like garbage. I'm not sure what it is. It feels uncomfortable and my form feels completely different. It also feels like I'm using a completely different muscle group. My coach says I look smooth and my form looks fine.
Has anyone else experienced this? How would I go about solving this? My main events are 5k and 10k. I understand there needs to be some uncomfortableness, but it just doesn't feel quite right.