For me the ‘pop’ is always coming from my back knee; I get an extra kick out of using the back knee. What I am doing is first bending my knees, then I push the back leg down then I pull the front leg up and that gives me the whip. When I lift off I pull my body above the boom so my bodyweight gets above the boom. I use the same technique for a chop hop, a shaka or a high jump. I train my knees by walking along the beach crouching and jumping off one leg. Don’t train only one leg or you will end up like me with at least 2cm more muscle on one side!
“ For me the ‘pop’ is always coming from my back knee.”