One of the things from Violence Dynamics in Minnesota. The drop-step is everywhere.
Not going to go into too much detail on what the drop step is. You can read that here.
Just the basic Dempsey drop step generates enormous power. But it also increases speed. Gravity is faster than you. And, if you can let the drop happen instead of make it happen, it’s untelegraphed. Gravity doesn’t flinch. It increases your range. It allows you to make powerful strikes (fast and untelegraphed) to your rear flank. And that’s just the basic drop step.
Drop steps can be loaded or natural. A natural drop step, you just lift a foot and start to fall. A loaded drop step you shift weight towards the foot you intend to lift so the CoG is farther from the (single foot) base that will remain. And there are dramatic ways to load a drop step. Look at the way a pitcher raises his center of gravity and extends the natural stride length to maximize speed in a throw.
In martial terms, baseball pitchers use a crane stance to load power into a front stance. Good body mechanics are universal.
The sutemi-waza, judo’s sacrifice throws, are another variation. And they work almost always– provided there is no telegraph. Once you clinch up with someone, you can choose to see yourself as a bipedal greature with a base and a center of gravity in a contest with a different bipedal creature who also has a center of gravity. Or you can choose to see the entirety as a four-legged creature with a shared center of gravity. And you have absolute control over two of the legs. Removing your two legs puts the CoG well outside the base instantly. Too fast for the opponent to read and recover. Again, all assuming there is no telegraph and you truly drop. You can’t do a controlled lie-down.
Sosuishitsu-ryu has a body mechanic for power I haven’t seen elsewhere, but at its root it is a loaded drop step for that four-footed animal. Trying to describe in words: You are locked up with uke, either in a tight clinch or a joint lock (do NOT try this at home with locks. Some of the koryu were very good at preventing uke from doing a proper breakfall and a few of the kata have uke landing on locked joints, including the neck. Really, really dangerous. Not something you want to experiment with without expert supervision.) Anyway, with that tight grip, you are one animal. Tori throws his left foot up as if he is doing a spinning crescent kick, turning to his left and throws the crescent kick coming all the way down to his left knee, spinning 180 degrees with uke attached. It’s brutal. And there’s a variation which takes the spin to 360. It is also very hard on your knees over the years.
On the ground, you can get wicked speed in some spins by creating spaces and falling into them. One we used in Minnesota was for weapon retention while face down. Bad guy is on your back going for your holstered gun. Not going into the mechanics of the technique here, but creating a space and falling into it correctly usually whips the bad guy off of you, even if there is a big size disparity. And crushes certain precious small bones, which is a bonus.
But the drop step is everywhere. Experienced people don’t split wood with just their arms. With every swing they raise their center of gravity and let it fall.
That’s another thing. Gravity never gets tired.