I'm late 30s and have run several marathons, each a little faster than the last, but has sort of peaked it seems in the 3:04ish area (2 marathons over last year in 3:04 and change). I tend to be on pace through 21 or so and then hit the wall and slow down. I've found that if I run much over 60mpw I get injured. I've been consistently running 60 mpw or so for the last couple of years after years of running in the 40-50 mpw range. Traditionally my training has just been 2 workouts a week: a "longer" tempo type of effort like 2 x 5k @ 6:35 and a long run (up to 22 miles, some with the last 8-10 at GMP). But in order to prevent hitting the wall I'm trying to incorporate a 3 workout schedule and also increase the amount of GMP running in my schedule. So here is my idea:
Monday: 7 easy (8:30 pace)
Tuesday: 7 w/20 mins @ "fast tempo" (6:25 pace)
Wednesday: 13-15 medium long run (some weeks add GMP miles at end)
Thursday: 5 easy or off
Friday: 8 w/45 mins @ "slower tempo" (2x5k @ 6:35 or 4x2 mile, that kind of thing)
Saturday: 5 easy
Sunday: Up to 22 mile long run (w/ up to 16 @GMP)
The goal would be to stay in the 60-65 mpw range, maybe up to 70 for a week or two, so the mileage would be adjusted to as to not go above those numbers, but this is the basic structure.
Toward the end of the cycle I would add in some sharpening VO2 max type of stuff like 5k pace mile repeats instead of the longer tempo.
Does this seem reasonable? Too much? Still too little?