Progression runs do wonders for speed, endurance, and fitness, preparing the runner to run faster farther into their race, hopefully, ideally throughout their race, but also offering a wide range of fitness benefits. Simply put, a progression run starts slower and gets continually faster; however, as with all forms of speed work for running, the many variations make it possible to tweak the workout, optimizing it for the desired race goal or training goal, keeping it interesting while still challenging. Progression runs are an excellent means of improving running fitness.