Researchers have discovered that incline walking on a treadmill is more effective at burning fat than running at the same intensity. A study published in the Journal of Exercise Science compared the calorie burn and fuel source of 16 healthy adults who performed two workouts: one session of steady-state running and another 12-3-30 treadmill workout with an incline of 12%. The results show that walking on an incline used more fat as a fuel source (41%) compared to running (33%). This may be because running relies more heavily on carbohydrates, which is why marathon runners are often advised to “carb load” before competitions. However, it’s essential to note that this study was conducted on a small sample size and that individual results may vary. Ultimately, the most effective workout routine is one that you enjoy, regardless of whether you prefer walking, running, cycling, or other forms of exercise.
Source: https://www.tomsguide.com/wellness/fitness/incline-running-vs-running-new-research-says-one-is-better-when-it-comes-to-burning-fat