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How do I prepare for a 20-mile run?

Author

James Craig

Published Jan 16, 2026

Get up at least two hours before the start of the race. Eat a high carbohydrate snack of approximately 300 calories. You may need more or less depending on your metabolism and you should have checked this out on your long training runs. Drink at least one water bottle (750 ml).

How long does a 20-mile run take?

“For example, at my long-run pace, a 20-miler will take about 2.5 hours. For someone else, that could take 4 hours. Those are two completely different levels of stress on the body!” Running coach John Honerkamp recommends capping long runs at 3.5 hours.

How do I train for a 20-mile run?

Try these strategies to finish strong:

  1. Fuel up with energy gels or shots throughout the race, so you aren't on empty as you hit the 20-mile mark. Be sure to practice this on your long runs so you know what foods work for you. ...
  2. Pace yourself from the beginning. ...
  3. Check your form. ...
  4. Psych yourself up. ...
  5. Use the crowd.

How long does it take to recover from a 20-mile run?

It's important to know that the body requires a range of 3-5 weeks to fully recover from a training run of 20 miles. The key is to do your 2-3 hour runs in the proper training phase of the Lydiard Method, which usually is in the aerobic base building phase.

Can you run 20 miles without training?

"If you're a runner and your body is conditioned to running 5k or 10k in distance, as long as you set your goals properly and you run at a very slow pace, you could probably get around," he says. "If you walk briskly at 15 minutes per mile, that's six-and-a-half hours to do 26.2 miles - most people could sustain it."

39 related questions found

Do marathon runners run the whole time?

Training may involve a long run on the weekends, with days off, easy recovery runs, and speed work during the week. Long runs can take anywhere from two hours to five hours. During the week, shorter recovery runs may only be 30 minutes to one hour. Long distance runners don't run "all the time."

How do I get in shape without running?

Like running, you can do these exercises with either your body weight or one other piece of equipment, like a rope or kettlebell.

  1. Jump rope. Jumping rope is easy and low impact. ...
  2. Boxing or kickboxing. ...
  3. Calisthenics. ...
  4. Moving planks. ...
  5. Overhead loaded carries.

How hard is a 20 mile run?

Running 20 miles is no easy task. Even after working up to the distance in the weeks or months prior, a 20 miler takes a toll on the body. Long runs require a significant physical effort. If you consider that the average person burns about 100 calories when running a mile, 20 miles could burn a whopping 2,000 calories.

What should I eat after a 20 mile run?

Here are 5 of the best foods to eat after running when your goal is muscle gain.

  • Chocolate milk. Chocolate milk happens to be a perfect post-run drink. ...
  • Whey protein shake. ...
  • Grilled chicken with roasted vegetables. ...
  • Cottage cheese and fruit. ...
  • Pea protein powder.

What happens to your body after running 20 miles?

At about 20 miles, levels of glucose in the bloodstream start to drop and the stores of carbohydrate energy in the body are almost depleted. Runners will become more aware of the distress signals that the various parts of the body are sending to the brain.

What should I run 20 miles in?

Eat a high carbohydrate snack of approximately 300 calories. You may need more or less depending on your metabolism and you should have checked this out on your long training runs. Drink at least one water bottle (750 ml). Have a warm drink to stimulate the bowel, but beware of caffeine.

Can I run a marathon if I can run 20 miles?

If you can run 20 miles, you can run 26.2! The 20 mile long run has become a staple in most marathon training plans, regardless of overall weekly mileage or training paces. It's the hallmark of marathon training, the run which many runners consider their peak workout.

Why do you not run a full marathon in training?

Immune system. Finally, studies have shown that the immune system is severely compromised after running the marathon distance, which increases the risk of contracting colds and the flu, especially if you intend to keep training hard in preparation for your goal race.

Is it healthy to run 20 miles a day?

The science shows that a 20-mile long run might, in fact, be right for you, but only if your weekly mileage is around 65 miles per week and if your long run workout pace is faster than 9:00 minutes per mile. Everyone else should consider the long run the Hansons way, by factoring in weekly mileage and pace.

Should I run everyday?

Running every day is bad for your health because it increases your risk of overuse injuries like stress fractures, shin splints, and muscle tears. You should run three to five days a week to make sure you're giving your body adequate time to rest and repair.

Is it okay to skip a long run?

If you happen to miss one there is no need to panic. It's ill-advised to skip to the next distance, considering that long runs can jump up by two miles at a time. For example—if you skip a planned 12 mile run, jumping from 10 miles to 14 can be problematic, opening the door for injury.

How do you breathe when running?

The best way to breathe while running is to inhale and exhale using both your nose and mouth combined. Breathing through both the mouth and the nose will keep your breathing steady and engage your diaphragm for maximum oxygen intake. It also allows you to expel carbon dioxide quickly.

How much water should you drink on a 20 mile run?

Some people feel the effects of dehydration hours after their run because they failed to drink enough fluids after they finished. Weigh yourself after your run. You should drink 20 to 24 fluid ounces of water for every pound lost.

What runners should not eat?

To dial in your performance, ditch these 12 foods:

  • Diet soda. Instead of sugar, diet soda is sweetened with artificial sweeteners like aspartame, cyclamate and acesulfame-k. ...
  • Cookies and candy. ...
  • Full-fat dairy. ...
  • Saturated and trans fat. ...
  • Alcohol. ...
  • Fried foods. ...
  • Caffeinated beverages. ...
  • High-Fructose corn syrup (HFCS).

What should I eat during a long run?

Common foods for runners include applesauce, dried fruit, banana, pretzels, saltine crackers, or English muffin with honey or jelly. Choosing more liquid carbs like sports drinks or sports gels can also help as they are easier to digest.

How can I recover faster after a long run?

Post-run Recovery

  1. Recovery during Run. The first step towards recovery actually takes place during your run. ...
  2. Stretch Thoroughly. Make sure to stretch immediately after your run. ...
  3. Eat Properly. After a workout, make sure that one of your next two meals is heavy in protein. ...
  4. Water. Constant hydration is crucial for recovery. ...
  5. Rest.

Does running reduce belly fat?

Studies have found that moderate-to-high aerobic exercise like running can reduce belly fat, even without changing your diet ( 12 , 13 , 14 ). An analysis of 15 studies and 852 participants found that aerobic exercise reduced belly fat without any change in diet.

What is the closest thing to running?

Aerobic exercises

  • Walking. Walking is one of the best exercises you can do to build up strength in your knee. ...
  • Swimming. Swimming is not a weight-bearing activity, so it's a great way to exercise without putting stress on your artificial knee. ...
  • Dancing. ...
  • Cycling. ...
  • Elliptical machines.

What can I substitute running with?

Alternative Exercises to Running

  • Alternative Exercises to Running.
  • Walking. If the intensity of running puts too much strain on your joints, walking is a great way to get cardio at a lower intensity. ...
  • Biking. ...
  • Swimming. ...
  • Anti-Gravity Running/Elliptical Running. ...
  • Zumba. ...
  • Sports. ...
  • High-Intensity Interval Training.

Do runners pee in a marathon?

Yes, marathon runners can and do stop to pee when they are running and there are many portapotties surrounding the route of the marathon. Those who don't mind about their finish time will be more open to detouring from their running route to find a portapotty and waiting in a queue if necessary.