User blog comment:ImperiexSeed/Caitlin's statement in 2x17 "Flash Back"/@comment-3481504-20161014215936/@comment-27700324-20161015052021

Despite us as human beings learning that speed is determined by when we move our legs at specific intervals, speedsters don't have to care about this. They just use the speed force to do it. So Tachyon particles and Velocity drugs affect the Speed force inside a speedster. It is not steroids for your legs.