Bison runner wrote:
Personally, I see merit to what everyone is saying here. Maybe do the long runs every other week, and always take the next day off so the body has 48 hours to recover. They do a lot of damage. Also, easy runs should be 7:00+ pace, even for elite athletes.
In other words, go hard Tues & Thurs for two workouts per week and do the long run on Saturday, progressive depending on how you feel. All other runs easy, recovery pace and Sunday off. This way, you effectively get three “harder” workouts per week and great aerobic stimulus without totally overtaxing the body.
The thing is it's always a trade-off.
For elite runners, take a look at for example the Ingebrigtsens-
in a standard build-up week, they got 2 BIG threshold days/week, AND a speed/leg strength day with 10x200 hills in each week. Do you really think they could handle a fast long run or fast finish long run on top of that? And even if you think they could, do you think they could still handle the same paces on the threshold days and hills? And even if they could do that, do you think they could actually recover from doing all these 4 things in a week? And even if they could do that, do you think they could do this for an entire 3-4 month build-up phase block? And even if they could do that, do you think they could do that for 10 years, staying injury free week after week and improve consistently?
It's always a TRADE-OFF. Fast long runs, like Canova prescribes in his marathon runs, are no joke efforts. They are serious efforts, taxing mentally, metabolically and physiologically (in terms of damage to bones, muscles, joints, tendons, ligaments, etc.). Doing them almost always means you need to cut back on the real, fitness-building workouts at threshold or race-specific paces or it's a recipe for disaster to just add them on top of everything else.
And for recreational runners - 3 big efforts/week is almost always more than they should be doing, improvements in fitness can only take place if recovery keeps up with the stimulus and for most that simply won't be the case with 2 serious, hard workouts AND a fast, taxing long run on top of it. And the argument - just take the next day off - is that ideal training? To run so hard that everything hurts the next day and training time needs to be taken off? Maybe it's better to run it easy, even use it to recover from the real fitness-building threshold workouts and then go again strong the next day.