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Why is My Longest Training Run 20 Miles?


Updated February 15, 2014

Runner Runs Past Washington Monument
Alex Wong
Question: Why is My Longest Training Run 20 Miles?
"I'm training for my first marathon and I was surprised to see on my training schedule that my longest training run is only 20 miles. Shouldn't I be running longer during training, in order to be ready to run 26.2 miles?"
Answer: Many first-time marathoners wonder why so many marathon training schedules don't go beyond 20 miles. How can you be prepared -- both mentally and physically -- to run six miles beyond your longest run?

Well, there's definitely a lot of debate about this issue. But most running experts will tell recreational marathoners that it's not a good idea to run more than 20 miles at one time during training. The reason is that running 20+ miles really takes a toll on your body. You'll need a long recovery period and you run a high risk of getting injured. Running 18 to 20 miles as your longest training run will prepare you to complete the marathon. So, the potential negative effects of running longer than 20 miles really out-weigh any possible benefits, such as feeling more mentally ready to run 26.2 miles.

During the two weeks before your marathon, you'll be cutting back your mileage. This tapering period will allow your body to recover from all those months of training. You'll feel rested and ready to take on the 26.2 mile distance.

Also, it's important to remember that being prepared for your marathon is not about just one long run -- it's about the consistent training you've been doing for months. If you've been following your marathon training schedule, you'll be ready.

More: Get the Most Out of Your Long Runs
Marathon Running and Training Mistakes to Avoid
Mental Tips for Long Runs

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