Is Running on a Treadmill Just as Good as Running Outside?

You Should Know: Runners tend to have very strong opinions about the treadmill versus outdoor running debate. But the real question isn’t which is “better” — it’s what you want from your workout. When effort is comparable, research suggests both improve cardiovascular fitness, endurance, and overall health. They offer different experiences, each with its own advantages and drawbacks. But depending on your goals — and what your body needs on a given day — one may be a better fit than the other. 

Going Deeper: Outdoor running exposes you to varied terrain, wind resistance, and elevation, which makes it best for preparing you for the conditions you’ll experience in an outdoor race. It also comes with a mental health bonus: Studies have found that exercising in nature can improve mood, reduce stress, and leave people feeling more energized than indoor workouts. Running indoors makes it easier to control pace and incline, which is a bonus if you’re doing speed or tempo workouts. They’re also safer, since you’re not exposed to traffic, weather elements, or wildlife. Treadmills may also reduce joint impact compared to running on natural surfaces.

Takeaway: Even though treadmills remove some of the challenging variables of outdoor running, they’re still valuable training tools and make running accessible to people who can’t or don’t want to run outside.

Bottom Line: Outdoor running better prepares you for real-world conditions, while treadmill running makes quality training easier to fit into everyday life.