Anecdotally, I trained for about 9 months using something close/similar to the FIRST programme (sprint/tempo or hills/long run - none of them slow). My Xtraining included swimming, biking and heavy weights sessions. Progress was awesome. Much better than when I first stated out and was only doing slower runs and building mileage.
I then started reading on here that 'Miles Build Champions'. I tried to increase the slow/junk miles (whatever you want to call them) very slowly. All that happend is over a period of 2 weeks, I felt battered, and by week 4-5 of this, my shins and calves went into meltdown and my interval sessions became painfully hard work as I was not properly recovered. On a couple of occasions during this period I had to stop my intervals and walk home due to cramp and shin pain.
I am now trying running without either extreme: 4 days a week, 6-8 miles, 7:00-7:30miles (for me this is aroudn 160HR, so quick but not quite quick enough to be called a "quality" session). No intervals/sprint/tempo work, but equally, no junk miles. Will report back with the results.
This way, I will have tried:
3 quality runs only - f**king awesome (25-30mpw)
Junk miles only - crap (50mpw)
Junk miles and 3 quality runs - total meltdown (40-50mpw)
Comofrtably hard miles only - currently testing (35-40mpw)
Edited: 31/10/2012 at 13:41