Hi, I have recently inherited a 7yr old cob,who has basically spent his life as a 'grass ornament' (owners description, not mine!!). He has mastered lunging and goes very well, however, as soon as there's a rider on him, he just can't seem to grasp moving forward. Trying to avoid reinforcing the leg with a whip but so far under saddle lunging, person walking in front and voice have all failed miserably!! Any advice? Please and thank you!