Whatever your goal race, you can benefit from incorporating these simple speed workouts into your running. (verywellfit.com)
Debbie @ Coach Debbie Runs recently posted... Running Wednesday: My Favorite Pure Speed Workout (confessionsofamotherrunner.com)
I just finished an interval workout on the treadmill, and I always do better speed workouts on treadmills because I can control the speed. (nutritionnutontherun.com)