We nearly bottled out when we saw a 12-year-old do a double somersault and back flip, but our nerves were calmed by our coach, Zane Hema, who said all we had to do was jump up and down ten times in a row. 'The idea is to stay on the cross,' said Hema. 'If you can't do that, then stay in the square, and if you can't do that, then go home.'