Depth Jump:range,speed,...

I’ve been reading alot lately about altitude depth jumps where you drop off a box and explode back up. My question is pretty much this, say you are doing a push-up when you drop down do you absorb the impact and immediately try to rebound up or do you catch, perform the rest of the eccentric and then try and explode up.What’ss the range of motion for these?

quick/short ground contact times. So as soon as you hit the ground rebound.

It depends on the range of movement worked.from small altitudes, landing with knees almost locked, you should try to rebound as fast as you can, but, if you depth jump from higher and with a greater knee flexion, you should actually try to absord and rebound fast, ( without touching the ground with your heels) but not with the same quickness of the exercise above.
Verchoshansky suggest to use the jumping reach as an indicator of both the height of the box and the correct tecnique.