Understand what soccer speed really is
To be honest I believe soccer speed is different than Usain Bolt 100 meter dash speed. In fact, they are not close. I think most of the time training for soccer speed should require short distances.
The reason strength is so important is because it helps you accelerate faster. And a lot of soccer speed is the ability to accelerate fast to get to a ball first, recover quickly, stay with an offensive man on defense, working give and goes with your team and more.
You have enough other stuff to work on like soccer skills that you should spend most of your speed training time on how to be fast in short distances. This includes agility.
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