There are several schools of thought when it comes to speed building and at some level of running I'm sure that actual track work and intervals become necessary but as a larger runner I've always gotten injured trying to do this kind of training.
My solution has been to spend a lot of time running up and down hills. As someone who is a trail runner with a mountain in my backyard this is pretty easy but I've also talked to flat-landers who ran parking garages and stairwells and they say it works great. Running uphill builds the leg strength for running faster and running downhill helps increase foot speed.
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