Flying Crane
Sr. Grandmaster
In training, movements and stances are often more exaggerated. This is a training mechanism that helps your body understand the correct movement better.I am having trouble kicking out of a wide back stance. I understand it is more stable and maybe in time, I will do it this way. The way I learned it in the past in TSD MDK, was, 70% of the weight on the back leg, front leg a little wider than shoulder width with the weight resting on the ball of the foot. From what I recall, we used the front leg as a jab. Anyway, I haven't started sparring yet in TKD so I don't know how I will adapt to throwing more kicks off the back leg.
In application, movement and technique is usually not so exaggerated. Your body understands how to do it correctly, and you can still do so effectively without the big movement.
So, there is a time and a place for everything.