5.6 Retired Athle tes Returning to Competition    5.6.1 If an International -Level Athlete  or National -Level Athlete in the IOF ’s Registered Testing Pool retires and then wishes to return to active participation in sport, the Athlete shall not compete in International Event s or National Event s until the Athlete has made himself or herself available for Testing, by giving six -months prior written noti ce to t he IOF  and their National Anti -Doping Organization.