The group, named 'Active Club England', has gathered more than 100 members, with one branch beginning biweekly training sessions at a park in Vauxhall, south London.
But this hasn't stopped the family from carrying out their own investigation, as they have been doing some 'crime scene reconstruction' to try and understand how the teenager was stabbed by her dad.
The family plan to appeal Simon Vickers' 15 year minimum sentence for murdering his only child after the 50-year-old construction worker told the court differing accounts of how his daughter died ...