Low to High, High to Low striking approach. Whether kickboxing, MMA, or boxing it is a solid approach to attack one level to open up another level. For example, let your punches to the opponent's head(high line) set up your kick to their body(mid-line or leg(low-line). Boxing, punch to the head to open up the liver shot to the body. MMA, punch to the head to open up your takedown attack to the legs.