What does England captain's trademark celebration mean?

Every time England's Owen Farrell slots a goal kick, he does his trademark 'JJ' gesture. Here's why ... Farrell dedicates every single point of his rugby career to 11-year-old Jack Johnson, who has Duchenne muscular dystrophy (DMD) – a genetic disorder characterised by progressive muscle degeneration and weakness. There are 2,500 DMD sufferers in the UK. Farrell's 'JJ' sign refers to the Joining Jack charity established by the boy's parents when he was struck down by the life-limiting condition in 2011. Farrell has played his part in raising awareness of DMD, which has helped provide funds for vital research into treatments. Full story [caption id="attachment_10137" align="alignnone" width="370"]Owen Farrell Owen Farrell and Jack Johnson[/caption]