Chris Newton, one of the higher level black belts who supervised the sessions, says keeping the students awake was not a problem.
"They train through the night with regular breaks so there is always something happening for them, and plenty of adrenalin and excitement keeps them going," he said. "Mental strength at this level is a key to becoming a black belt as well."
During the night the students ran around the Tauranga estuary from midnight until 2.30am before they went over to Mount Maunganui and walked to the top of Mauao.
"They trained for an hour and a half up there, then walked down and around the Mount, and came home for breakfast," Newton said.
Most of the 15 aspiring black belts achieved their goal and were awarded their belt at a special ceremony.