I have a 6 year old quarter horse that I got about two months ago he has basically been sitting his whole life. I have been doing some ground work with him and some light riding. The problem I am having is that I can get him to start to lunge he will go about 2 times around me at a nice trot then all of a sudden he will just take off and I can't stop him from taking off since he has so much force. He will however free lunge perfectly. Do not know what to do about him taking off any suggestions???