Focus on running style, balance, coordination, and kicks.
Stretch elbows forward and backward. Relax hands and fingers. Stretch ankle-joints when foot leaves the mat and point tips of toes against the mat. Flex stomach, back, buttocks all the time. You MUST kick with both left and right foot with these kicks: push pass, flick pass, and instep pass. Time: 35 seconds, rest for 40 seconds. Repeat 6-8 times.
Soft gym mat, alternatively 4 towels put on top of each other.