My concern is to improve my 3 mile time because that's the relevant distance for the USMC PFT. I only do interval work for that goal, not because I specifically want to improve my 400m time.
Your problem is sustaining intensity. That's what interval training does, it extends the time that you can run as hard as you can, and helps you push past the wall.
How far are you running intervals at present? How many of them do you do in a session?
Also, they would be expected to run a 2:42 800m... I'm nearly a minute slower than that!
I know you're going to call me a crank, but if you can consistantly put in sub minute 400m times, then you can work with that to help drop your times for everything else. It's your foundation, and you want that to be solid.
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