You’ve never spent half an hour like this. Prepare yourself for the next generation of cardio HIIT training, with every second supercharged in a blitz of lightning-fast intervals. Use your body weight and a step bench to blaze your way up and down innovative sequences that will crush your personal best, then switch to actively recover without slowing to a halt. A complete cardio challenge that demands everything you’ve got and incinerates your goals in thirty flat. Be glad it’s not longer.