ricardo wrote:
For example, last week I did 5 sessions like this:
Monday: 9,5 miles @ 8:00
Wednesday: 11 miles @ 9:26
Thursday: 6,5 miles @ 8:25
Saturday: 8,5 miles @ 9:12
Sunday: 7 miles @ 8:45, did some 400's with a friend in this session so the average pace is not really relevant here.
I do intervals sometimes but not really structured. a couple 400's at around 6:20, 1000's at 7:00.
Training should be event specific. A sub-20 5k is 6:27 pace. Your paces are 8:00, 9:26, 8:25, 9:12, 8:45. I'm not saying you need to run a 6:26 mile pace on these runs, but you need some work every week closer to goal race pace. If you're going to run 3-4 days a week, you should have three quality workouts each week: intervals, tempo, and a long run. The intervals and tempos should be closer to (or faster than) your goal race pace.
INTERVALS: There are lots of variations for intervals... ladders or reps of distances from 400m to 1 mile. I'd suggest 5x1000m at 6:26/mile pace if you can handle it. If not, either shorten the distance (6x800m) or slow the pace so you can finish the workout. A set distance isn't better than a ladder, but it's easier to track your improvements.
TEMPOS: Warm up 15 minutes or so. Strides and drills. Then, run a tempo. You might start at 2x10minutes or 3x1mile and build up to 1x25 minutes. Pace should be slower than 5k pace. Until you get a feel for what you can handle, try running these at 10k pace or a few seconds/mile slower.
LONG RUN: Conversational pace for 90-120 minutes.
Your 4th running day can be an easy recovery run of 60 minutes or so.