body postion, turning the handlebars, tire pressure, throwing your weight, all comes in due time with practice and everybody has their own way and preferences. but the way i see it theres only 4 things necessary to do a circle: lean angle, wheelie height, speed, and throttle/brake control (dippin n blippin). to do em fast and wide you increase speed, decrease wheelie height and increase lean angle. to do em slow you decrease speed, increase wheelie height and decrease lean angle. and depending on what part of the bike you are standing/sitting on will also require adjustments to the equation. its all just a huge math problem. but way easier said than done. took me a really long time to learn them, so dont get too frustrated.