HIDILYN DIAZ is back home after spending 20 days in Malacca where she managed to get a respite from the hustle and bustle of a celebrity life the moment she won the country’s first Olympic gold medal in Tokyo in July. And now that she’s back, Diaz also returned to the gym to keep her gold medal-winning form and at the same time focus on her studies at the College of Saint Benilde. “We’re already here and we’re already doing twice-a-day training,” the 30-year-old Diaz told BusinessMirror on Tuesday. Training for Diaz and fiancé Julius Naranjo is at the Stronghold Athletics gym in Greenhills, Sa…