That's it! You don't want ass-fling-age. Ass fling-age is bad! Makes them fall in to a turn which means they are unbalanced and not ready to respond to you or get themselves out of trouble if something happens. Case in point, you go around a cnr on a track and it crumbles on the edge where he has stepped after rain (HA! Remeber that stuff?) undermines it. If he is balanced he will simply shift his weight autimatically to the other legs and apart from stumbling, will go on like nothing happened. If he's unbalanced he could loose his footing, the stumble could be worse, or as happened to me once, he'll slip down the mountain side on his ass and scare the living crappola out of you :P Also you will find he will be better prepared for your signal to either go slower or speed up if he's working with his butt 'engaged' and the whole thing will just be a hell of a lot easier on you both. It takes a bit of getting used to so don't stress. Kind of like learning to drive a stick-shift, just got to get the co-ordination. Saw you ride, you move naturally with your horses' movement and compensate for the ground level automatically, plus you listen to your horse. You'll be out riding the rest of us in no time :-)