as people said before, keep forward pressure on your shins/tongues of the boots, maybe set a slight carve and stiffen your legs for the pop, its not about an abrupt jumping motion, its about releasing into whatever trick you are doing
Im not all about the gorilla steeze I see kids doen these days but I like to stay compact (ready for impact?) haha
just be careful about the speed/pop issue I tend to overexagerate my pop which means I need less speed almost always contrary to what I think