He's probably talking about AIS (Active Isolated Stretching). It's a controlled range of motion stretch, that unlike traditional passive stretching, isn't held for 10-30 seconds.
An example would be lying supine, raising one leg straight up, and using a short length of rope to assist in stretching your hamstring; prior to gently pulling the rope, you are counter-contracting your quads, hips, and abs---this essentially forces your hamstring to relax, enabling you to stretch it further.
He also may be talking about dynamic stretching. Hard to tell unless he has explained himself.
Either way, those are two of the best types of stretching out there.
"You do not truly know someone until you fight them."
- Seraph, The Matrix Reloaded