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Which Is Better: Running Outdoors or on a Treadmill?

by
author image Jody Braverman
Jody Braverman is a professional writer and editor based in Atlanta. She studied creative writing at the American University of Paris and received a Bachelor of Arts in English from the University of Maryland. She also received personal trainer certification from NASM and her 200-hour yoga teacher certification from YogaWorks.

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Which Is Better: Running Outdoors or on a Treadmill?
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Some runners hate to be stuck inside on a treadmill, especially when there’s beautiful weather and great terrain available outside. Other runners appreciate the convenience of hopping onto a treadmill and getting their workout in without having to consider routes or weather. But which one is better? The easy answer is that neither is better than the other, from a physiological standpoint. Running on a treadmill that’s set correctly will closely simulate running outdoors, so the benefits are largely the same, though there are a few essential points to keep in mind. Read on to get some useful tips to make sure you get the most out of your outdoor and treadmill runs.

Adjust Treadmill Incline to Approximate Outdoor Running
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ADJUST TREADMILL INCLINE TO APPROXIMATE OUTDOOR RUNNING

Without making any changes to the treadmill, running on a treadmill will be easier than running outside on a flat road. The biggest difference is that the belt is moving underneath you so you don’t have to push off the ground against air resistance to propel your body forward. According to a 1996 study published in the Journal of Sports Sciences, the lack of air resistance reduces the energy cost of running. Researchers measured VO2 max -- a measurement of the body’s oxygen use during exercise -- in trained male runners and found that setting the grade of the treadmill to one percent best reflected the energetic cost of running outdoors on a flat road.

Related: 12 Running Mistakes You Could Be Making

One Advantage of Treadmills: Shock Absorption
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ONE ADVANTAGE OF TREADMILLS: SHOCK ABSORPTION

Exercise treadmills have come a long way since they started appearing in the late ’60s. Early versions didn’t offer much in the way of controls or shock absorption.. These days, treadmills come with all the bells and whistles. You’re able to completely customize your workout -- manually adjusting the incline and speed, choosing a workout program or tracking your heart rate. You can even watch a movie or listen to your favorite podcast while you’re working out. The treadmill decks also have improved shock absorption, which can reduce the impact on your joints. One major manufacturer claims its technology reduces impact by nearly 30 percent.

Related: Cardio 101: How to Start Running

One Advantage of Outdoor Running: Variety of Surfaces
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ONE ADVANTAGE OF OUTDOOR RUNNING: VARIETY OF SURFACES

Running outside offers myriad options, which is a definite plus. Most towns and cities offer sidewalks, paved trails, dirt trails and grassy areas. Many runners will also have access to running tracks, mountain trails and sandy beaches. Such variety results in greater stimulation of the senses and, according to sports-performance coach Hannah Schultz, less risk of overuse injuries that can result from running on just one surface, whether that’s a treadmill belt or pavement. “You don’t want to be running on pavement every single day,” says Schultz. “Take it to the track every now and then and get some cushion underneath you.”

Related: 4 Common Running Myths Debunked

One Advantage of Treadmills: Training on Custom Hills
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ONE ADVANTAGE OF TREADMILLS: TRAINING ON CUSTOM HILLS

One of the benefits of treadmill running is that it’s a highly controlled environment. You don’t have to worry about wind or rain when you want to go for a run. You can also choose your terrain. “I’m a huge proponent of hill training because I think that makes you stronger. I call it the secret weapon,” says elite-level coach Keith McDonald. But not everyone lives near a hill. “Running hills on a treadmill is great because you can get the incline and then you can recover -- incline, recover, incline, recover.” The same goes for speed training, says McDonald. If you want to do a speed workout and carefully monitor your pace, you can set a program on the treadmill that allows you to do that.

Related: Essential Summer Safety Tips for Runners

One Advantage of Outdoor Running: Avoiding The Boredom Factor
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ONE ADVANTAGE OF OUTDOOR RUNNING: AVOIDING THE BOREDOM FACTOR

Do you ever find yourself dreading (or even skipping) your treadmill workout? If so, switching up your routine and heading outdoors could be the solution. When you run outdoors, all your senses are stimulated. You hear the sounds of the city around you or the birds chirping, you feel the wind on your skin, you can smell the aromas of backyard barbecues and you can people watch. But there’s also an element of danger to running outside: You need to be careful in traffic and dodge obstacles like boulders and the neighbor’s ferocious Chihuahua. You just can’t replicate that on a treadmill, unless your idea of sensory stimulation is watching the latest episode of “The Real Housewives of New York City.”

One Advantage of Treadmill Running: Avoiding Inclement Weather
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ONE ADVANTAGE OF TREADMILL RUNNING: AVOIDING INCLEMENT WEATHER

Even die-hard outdoor runners have to take it inside sometimes. Depending on where you live, running outdoors in the middle of the day at the height of summer can be not only difficult, but also dangerous. If you have to get in your run, a treadmill in an air-conditioned space starts to look more appealing. Certain other safety considerations can prohibit outdoor running and make a jaunt on a treadmill the better option. Thunderstorms, icy conditions and darkness in an unsafe part of town are all good reasons to bring your workout inside. That doesn’t mean it has to stay inside, but a treadmill is a good temporary solution for running through a heat wave or a winter in North Dakota.

Related: Gear for Safe Night Running

Which Option Is Best When Training for a Race?
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WHICH OPTION IS BEST WHEN TRAINING FOR A RACE?

Whether treadmill running or running outdoors is better for you depends largely on your goals. If you’re training for a road or trail race, it doesn't make sense to do most of your training on a treadmill. “If you’re training for a marathon, obviously you want to make sure that some of your training is on pavement so your body knows what to expect on the day of the race,” says sports-performance coach Hannah Schultz. If you’re running a mountain trail race, you want to spend plenty of time running on trails to develop reaction time and agility, which come from having to dodge obstacles and deal with uneven terrain. A treadmill isn't going to help you there.

Related: Training for a Faster 5K

Treadmills Offer Reduced Impact for Injury Treatment
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TREADMILLS OFFER REDUCED IMPACT FOR INJURY TREATMENT

When you’re dealing with an injury, you want to be sure to choose your running surface carefully. Treadmill running offers a controlled environment, and quality machines offer reduced impact with shock-absorbent decks. “It’s a great rehab tool because most treadmill decks are spring-loaded, so when you impact it actually gives,” says elite-level coach Keith McDonald. But some outdoor terrains like grass can offer soft surfaces for rehab too. Once your physical therapist gives you the green light, low-intensity runs on a grassy field are a good first step. According to a study published in the Journal of Sports Sciences in 2012, running on grass reduces stress on the musculoskeletal system compared to running on firmer surfaces like pavement and concrete.

The Importance of Outdoor Pacing
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THE IMPORTANCE OF OUTDOOR PACING

Treadmill training offers a controlled environment for pacing: You set a pace and the machine forces you to run at that pace until you manually slow down the belt. However, this doesn’t help you learn to regulate your pace outside. You might be able to run an eight-minute mile for five miles on a treadmill, simply by setting it and forgetting it, but it’s going to be tough to keep that same pace for five miles outside. Being able to do that outside is critical for race-day success, says elite-level coach Keith McDonald. “To be able to do that no matter what the course is giving you, whether it be wind or rain -- that’s a great mental breakthrough. Because no matter what the course gave you, you held on to that.”

Related: How to Calculate My Running Pace

Is Your Running Gait Different on Treadmills?
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IS YOUR RUNNING GAIT DIFFERENT ON TREADMILLS?

You might assume that your body moves differently while running on a treadmill versus running outdoors, but research proves that’s untrue. Researchers published a study in the Journal of Applied Biomechanics in 2010 that analyzed the gait of runners running on both treadmills and on land at similar speeds and found no significant differences in the kinematics (movement patterns) of test subjects’ hips, knees and ankles. Another study, published in Medicine and Science in Sports and Exercise in 2008, also found that the movement patterns of a treadmill gait were similar to those of an overland gait. This means that whether you choose to run on a treadmill or outside, you’ll experience little kinematic difference.

Related: The 8 Best Stretches to Do Before Running

The Advantage of Experiencing a Variety of Outdoor Terrains
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THE ADVANTAGE OF EXPERIENCING A VARIETY OF OUTDOOR TERRAINS

If you only run on a treadmill, you may begin to experience overuse injuries because your legs and feet are always moving in the same way. Outdoors, you’ll experience a variety of terrains, which requires the use of different musculature, so that no one muscle becomes overused or underused. “Running outdoors, your foot is always having to adjust to whatever surface it’s on,” says sports-performance coach Hannah Schultz. If you encounter a hill, your glutes and hamstrings have to work harder, and going downhill fires up your quadriceps. Running on the same surface could lead to imbalances over time, Schultz explains. To avoid this, take your workout outside every once in a while.

Related: The Best Running Shoes for Beginner Runners

How to Make Treadmill Running More  Fun
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HOW TO MAKE TREADMILL RUNNING MORE FUN

If you typically detest treadmill running, but weather conditions prevent an outdoor workout, you can make the treadmill more bearable. Elite-level coach Keith McDonald recommends doing interval workouts on a treadmill. During interval workouts, you’re varying the speed every 30 seconds to several minutes, alternating periods of sprinting with periods of recovery jogging or walking. This type of training gives you a more intense workout than a steady-state run and also builds cardiovascular fitness. You also won’t die of boredom. “If you are on a treadmill and you’re doing a workout like that, it goes really fast so you’re not going to drive yourself nuts,” says McDonald.

Related: Beginner’s Interval-Running Workout

Variety Is Key
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VARIETY IS KEY

Ultimately, the best type of running is the kind you most enjoy. If you don’t like your workout, then it’s highly likely you’ll skip it, missing out on health and fitness gains. Sports-performance coach Hannah Schultz recommends mixing it up: Do a speed workout on a treadmill one day and then go for a long trail run the next. Not only will this help you avoid potential repetitive-stress injuries from doing the same physical motion all the time, but it will also help you prevent the boredom and burnout that can result from a repetitive workout routine.

Related: Advantages of Being a Runner

What Do YOU Think?
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WHAT DO YOU THINK?

Do you run regularly? What is your typical weekly mileage? What’s your favorite place to run and why? Do you have tips to make your outdoor runs and treadmill workouts more exciting? Share your thoughts and suggestions with Livestrong readers and staff by leaving a comment below.

Related: 17 Proven Motivations to Get You Running

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