Plyometric High Intensity Interval Training? Huh?? Plyometric training and HIIT are two very opposing concepts. Using plyos as a conditioning tool is one reason they get such a bad rap. It's the same thing I wrote about with Olympic Lifts. Repetitive jumping is a great way to develop patello-femoral dysfunction.
It's just another example of good tool in the wrong hands. Hopefully these clowns don't work with other human beings. I am a HUGE fan of plyos but this is just absolutley ridiculous!!
I am all for making interval training more fun. But to have this many plyometric foot contacts in one session is just asking for trouble........no matter how good your form is. Make it a general rule to stay around 25 foot contacts per session and no more than 100 in a week. Focus on quality not quantity.