So my 400 and 800 times were from my Junior year of high school (about 4 years ago) where my coach had me run a lot of 800's because I could consistently run 2:04-2:05 for our 4x800. I was very weak muscular wise and just had terrible form so my coaches didn't think I'd be a good 4x4, 800 guy. The online coach I ended up working with last year didn't think my speed was good enough to focus on (our goal was to walk onto my college team). I think my speed was okay last year but we never ran any speed workouts because our goal was a 15:30 5k. Currently I don't have the speed I used to (probably because I haven't done any true speed work in like a year). I'm definitely not opposed to developing my speed as a mid-d guy but I'm not exactly sure how to structure my training to do so.