Серии ударов ногами на скорость по шинам.

My favorite exercise for developing the ability to perform all kicks in any sequence. Completely spontaneous series of kicks, the body works on autopilot. Set yourself the goal of knocking down four tires as quickly as possible, and making sure they fly off the ground. Let go of your mind and just kick. For me, this exercise makes my whole body feel like a machine, more powerful than any kata.