How did Roy Jones Jr reach such high levels of speed?

[Vadrigar.]

Granted it was genetic. No doubt about it.

But it much have been technqiue as well. Did he have any unusual techniques or did he just do the usual but very very quickly?

Steroids that add lean mass quickly such as Deca Durabolin (nandrolone decanoate) which can be used to train specifically for speed. So the muscle takes on speed like characteristics.

[RAGALAC]

I read or seen somewhere that to train his dad would throw small 2x4s at me with nails in them so he kind of had no choice but to move fast.

[TysonBomb]

he's an alien