For the sake of those misguided souls who ignore science and choose to include "functional" and explosive training in their strength routines, I've posted this link to an article written by Ken Mannie, Head Strength & Conditioning Coach at Michigan State University.
"The subject of explosive weight training is one that has been in the center of a maelstrom among strength and conditioning practitioners for quite some time. Many individuals and some associations advocate the use of so-called explosive weight training movements, which purportedly offer trainees a distinct advantage in speed and power development over those who choose to incorporate more controlled movements".
read more at baye.com