”She got the Jack , Jack , Jack !”  Everybody knows this song by ACDC (My favourite hard rock band by the ways) . This is the coaching version invented by French national javelin coach Jack DANAIL . He has invented the ”jack stick” , just a stick with 2 rubber bands , but , with a bit of inventiveness , it has become a real good training implement for throwers. With him , we made this video with a compilation of possible exercises . A good way also to break the training routine and increase the motivation of the athlete. So , look at this video , build your own ”jack stick” and eventually find your own exercises that you will be kind to send us to share with fellow coaches . Thanks to Jerôme HAEFFLER , a French 80m + javelin thrower for the demonstrations.