Assisted jumps! But why would you do this? The simple answer is to build explosiveness with NO LIMITS!
The force-velocity curve dictates the differing blends of FORCE and VELOCITY that must be present to complete a movement successfully. A maximal squat is all force production, whereas a maximal vertical jump is a blend of force production and speed where the more quickly force can be produced the faster the body will travel at ground release and the higher it will go.
If you want to improve these explosive physical qualities then you must improve the ENTIRE force-velocity curve, otherwise you'll quickly hit a ceiling. The simplest way to think of it is like this from top to bottom: heavy squats, Olympic lifts and weighted jumps of varying weights, unloaded vertical jumps, and then assisted jumps, as shown here, which would be similar to overspeed training for a sprinter. These 4 categories of exercises would cover pretty much the entire spectrum.
By working the whole spectrum like this you could theoretically positively shift your force-velocity curve forever and build unlimited explosive power. The assisted jumps are just a piece of the puzzle. They aren't any kind of end all be all. But they do have a great value in the grand scheme of things and they're just plain fun as well!
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