Strong correlation of maximal squat strength with sprint performance and vertical jump height

In this research article the researchers found strong correlation between sprint speed, vertical jump and squat strength.  If you are an athlete, and one, or more of these things are important to your performance, practice these skills.  Forget the agility ladders, and the other toys, get strong first, practice sprinting and jumping, and watch the improvements happen.  You have to build a stronger engine, before you make a faster car.