to reflect their best performance. Usually the routine must have a minimum (and sometimes at lower skill levels, a maximum) degree of difficulty. Compulsory Routine (Set) – A routine which has a set list of skills and a set order which must be followed by all athletes in a competition. No degree of difficulty marks are given for this routine; the marks are purely for execution. Time of flight (ToF) – A score added to the execution score which reflects the time the gymnast spends in the air when performing the routine. Horizontal Displacement (HD score) – A score added to the total score. The score is calculated by how much the athlete is out of the "box" during the routine. References http://peaktrampoline.com.au/wp-content/uploads/2015/09/AUSTRALIAN_LEVELS_PROGRAM_2014.pdf External links Trampolining Glossaries of sports Wikipedia glossaries using unordered lists