According to this Runner’s World article, there is no right or wrong way to run. It writes “In fact, both modalities have their pros and cons, and each can help you get stronger and faster, whether you’re looking to train for a race or just get in a cardio workout. Frankly, you’d do best logging miles both inside and outside. Here’s the breakdown of running on the treadmill vs. running outside.”
There are pros and cons to both running outside and running on a treadmill. If you are just interested in cardiovascular benefits, a treadmill is a great option. But if you’re training for a race, you will benefit more from running outside (for at least part of your training). In the end, figure out which option works best for you and work both into your routine as much as possible.
- Is Running on a Treadmill Harder or Easier Than Running Outside? | Runner’s World