Before attempting speed training especially with sprint training, you should be able to run at least 3 miles with no problems. I find that sprint training involves intense cardio strength. After doing sprint training it feels like your heart is going to fly out of your body. So I think it’s recommended that if you have any heart conditions to consult your doctor before proceeding.
There are many benefits for a runner to do sprint training and one of them is that it helps your body burn fat at a might higher rate than if you were to run at a constant pace. Your leg strength and lung capacity will of course be improved. For long distance runners, speed training should be done at least once a week but is not a main focus for us. You need to couple any speed or hill training with a warmup, cool down and stretching to prevent injuries. Pick a distance about 100 meters for your sprint.
If the minutes are too short, feel free to sprint for a longer period of time. I think if you sprint longer than 1 minute, then it becomes more of an interval run which serves difference purposes. You should see results within 4-8 weeks if you consistently do your speed training – sprint runs.
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