Tsat claims that you do isometric exercise of the muscle as the only warmup:
I can't quote Tsatsouline's book by memory, but I remember correctly that he says it's not necessary to warm up before stretching. Yes, warming up is not needed for light stretches. But for the type of stretching his books claims to teach, Jesus, that's a sure recipe for a groin pull
(I think) This is kind of similar to the PNF principle that you contract a muscle prior to stretching it so that you stretch the muscle as the "relax" reflex is occurring.
"Muscles should not be forced into any stretched position unless they have been
previously warmed up through pre-loading," warned East German specialists J.
Hartmann and H. Tunnemann. This may be a bit paranoid, but an isometric
contraction held for up to a minute indeed brings in a pool of relaxing blood
into the muscle. You do not need to do any special warm-ups; they are a total
waste of time.