hmmm,honestly...these exercises suck. they can be used if you're a
total beginner in jumping,but they can only be used if done with
proper technique,and you definitely don't have the proper technique for any of these exercises in the vid. for your own safety, stop using your heels while landing and running,and please,don't make videos in which you say "this will increase your bla bla bla bla",unless you're sure it's efficient and relatively safe,because you're lowering your respect.
regards and keep that good will,but start reading about plyos and vertical and then do the practical part.
