Folker System Vert Shock PDF Free Download. Vert Shock is a new vertical jump training system developed by Adam Folker and Justin ‘Jus Fly’ Darlington. It was made specifically to help athletes improve their vertical jump. The program guarantees to increase your vertical by 9-15 inches in the course of just 8 weeks and have you dunking in no time. It’s a pretty bold statement and if you know me you’d know I don’t believe in fairy tales and magic solutions… Nevertheless, I didn’t let it stop me from trying it because the guys who created it, Adam Folker and Justin ‘Jus Fly’, are pretty famous and their name is attached to this program so they won’t waste their time building a shitty product.