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I recently uploaded (Feb '18) a video on plyometrics and how to get the best out of them on my youtube channel It's proving very popular in the short space of time it's been on YT so far (it's below if you want to take a look). It did get me thinking about how much athletes really understand about the training they do and in this instance plyometrics. When I was a young athlete myself (18-20) I found some books in the library (does anyone go to libraries anymore?) and leant some things about jump training and plyos. But I wouldn't of understood about how plyos can be tailored to the long & the triple jump i.e. to make them more specific to the different jumps' needs. Nor would I have been aware of tendons and their crucial role in energy return, nor indeed what leg stiffness was and how it can be trained to improve jump performance - if the term was even in use back in the three channels only on TV in the UK days!
It seems that young athletes still need to find out about this information as would appear from the popularity of this video and another on plyos, for example, on my channel. I think the key aspect might actually be, knowing what to do with the the information that is now widely available on all manner of training methods through social media and the www i.e. knowing how to make them work. In a couple of minutes you can see 50 plus jumps exercises on your mobile - but do they work for you and your needs? Jumping onto boxes from a standing start is a case in point... very impressive, but does that ability to jump translate into being able to run in over 10m/s to hit a 20cm board and impart and absorb enough force in 12-13 milliseconds to jump 7.80m plus in the long jump. Probably not. Yet, there are hundreds of thousands of similar jump videos particularly on Instagram of people piling boxes on top of each other and jumping (or not) up onto them.
If you want to be good at long jumping then you need to do exercises that are tailored toward long jump and these need to be the bread and butter of your training. Sure you can jump up on boxes if you like but just make sure you can absorb over 4 times your body weight on one leg at a touch down velocity that would equate to running 10.5sec for the 100m and then land in the pit let's sat 8m/26 feet later!