I've got a 10K coming up on the 4th of July and have been throwing in some speed interval training over the past several weeks. So far I've been doing 1mi warm up at 1min slower than my desired race speed, and then 1mi x 6 repeats either right at or just below race speed, followed by a 1mi cooldown at the same speed as my warm up.
I recently read that I should try 2mi x 3 repeats instead, and that if I can do all three at race speed then I should be good to go.
My question is, when specifically considering a 10K, is there an ideal distance for repeats, either broken up by 1mi x some number or 2mi x some number?
Should 6mi be good or should I try 8 miles of repeats?