Make a base wrote:
For 800m the summer is all about 3 things-
Top end speed: plyometrics, short hill sprints with big recoveries, weight training, drills, strides etc. These should never be hard or very anaerobic, save that for later in the year.
Improving aerobic endurance: mileage. Run the highest you can without injuring yourself or compromising on other aspects of training. You need one long run a week which you should aim to build up to about 10 miles.
Increasing lactate threshold: every week do one 5k pace interval session (eg. 6x1k, 8x800) and atleast one tempo run (3-6 miles run just under the pace where lactic starts to build up). Note the better your aerobic endurance is the more you will be able to increase your lactate threshold
All this will build a good base for the typical speed endurance, race pace stuff you will do later in the year.
This is good advice. I couldn't believe that the first post was based on mileage. The guy runs a 61 400 and wants to get under 2.05, and you talk about mileage? Doesn't matter what mileage you run, you won't be running 2.05 with a 61 second 400 PR.
I would add that as part of speed development - sleds and the right gym work. Work the CNS hard, twice a week.
One other thing is I would suggest diagonals. These should be at close to 800 pace. Stride the diagonal of a football field, turn left, jog the sideline, stride the diagonal when you hit the next corner, jog the baseline etc. After 4 you end up at the same start point. You should do at least 16 to start off with, and try to build it up to 25-30. This is excellent for getting your mind and body used to running at the fast, relaxed 800 pace, but because the reps are shorter, doesn't kill you with lactic.
I am not so sure about the long run though. I guess you could do one for a month or two, but after that I would replace it with a 40 min progressive run, and then move on to cruise intervals (5-8 x 1km reps at 8km pace with 90 sec recoveries or similar).
I also think in base some tougher aerobic sessions are worthwhile, like fartlek or vVo2max. 10-15 x 1 min hard 1 min easy, hard at 2km pace and easy at 60% of that pace. This is also a classic treadmill workout if it's too cold or wet. You can also build it to 6-7 x 2 min hard 2 min easy at the same pace.