Matt Fitzgerald recently wrote on an interesting topic, asking: At what minimum volume does 80/20 training cease to be useful? I had some useful, common sense thoughts on the topic… that turned into the much longer piece below on endurance training, and how it must evolve past the basic runs consistent in most runners’ training plans.
First, to address Matt’s question… I think it’s important to consider the length of your goal event. Short of the marathon, I think it’s important during easier runs to practice running the duration or distance you plan to run your goal race, to accustom your body to the volume of running required.
For shorter events, this is easier. A 5K (3.11 miles) takes most runners 20-40 minutes, so it stands to reason you should be running at least 20-40 minutes or about 3 miles in easy runs. Doing 1 mile or 5 minute runs aren’t going to help you much at all. Hal Higdon has the right idea for beginners: Just work on running easy as long as you can uninterrupted until you can run 3 uninterrupted miles. That task in itself will suitably occupy most if not all of your training for such a race.
Something longer like a 10K (6.21 miles) might take more like 40-60 minutes. Even if you don’t run 6 miles regularly, running 40-60 minutes regularly in easy runs is probably a better idea than just brief 2-3 mile runs. Even your easier runs should have some specific application to the distance or time you plan to race.
It becomes more complicated running a half marathon, marathon or more. A 13.1 mile Half requires around 90-150 minutes of racing for most. Obviously, it’s not reasonable for most people to run 2 hours or 13 miles everyday. And of course the marathon requires a limit-busting 26.2 miles, and can take several hours. No one in their right mind will ask you to run that much.
The 60 minute race threshold is where a trainee should cease trying to run the distance in easy workouts, and focus instead on aerobically beneficial workouts: