Running negative splits during a race is nearly always the best strategy to use for top performance. Running negative splits is a skill and technique that you need to practice to perfect. Progressive training runs are workouts in which you increase your pace throughout your training session. Progressive training runs have many aliases including fast finish runs, increasing pace runs and progression runs. No matter what you call your progressive workouts they are valuable training runs for becoming efficient at negative splits, improving your lactate turn point, increasing your mental toughness and training both your neuromuscular conditioning and your central nervous system conditioning.
Here are some tips, articles and workouts on progressive training runs.