Run with resistance. That is the key to speed development I believe. Resistance band work, sled work, hill work, sand work etc. any kind of resistance that forces you to produce more power is going to help you with your speed.
Stretching. I think this is a very underrated aspect of speed development. Stretching is so important because you need to be able to drive your knees but that can’t happen if your hips are so stiff that you cant even lift your leg. You need to have loose hips and legs in order to be fast. It also helps with your stride length. When people have really stiff legs their strides come up short
Lastly, exercises on your own in the weight room develop speed. You need to work in the weight room for speed. There is a limit to how fast you can get without weight room work. Explosive exercises like power cleans, plyometrics, jump squats, jump lunges etc. will all help you produce more power and explosion which will lead to your speed increasing.
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