stance! i good deep stance is what you need. it will help a heck of alot. then you need to keep distance, they cant take you down if they are far away, so good fast kicks and if you need punches. if there coming from a charge there are things you can do: firstly if they are lighter to abit heavyer then you, you can take them, all you need is a good stance and you can hopfully fight them from putting you on the ground. if they are heavyer you'll want to get out of the way, a fast side step with something like a knife hand to the back of there neck will do. just as long as they are goin to get back up its ok. hope this helps, i think i went off on one about that defence bit there hope its helpful anyway.