My husband and I rescued a 17 year old horse in October who was basically being starved to death. He was on an acre of land with a donkey, mule, steer, alpacha, pot belly pigs (at least 2) and 4 to 5 goats, as well as numerous chickens. He had absolutely no grass and the owner readily admitted she could afford to buy hay. Needless to say, I gave her $150 bucks to save his life. Since we have had him, we have been feeding him senior feed, beet pulp, and suppliments twice a day. His weight has improved and the vet say he is now a 5 borderline 6 on the weight scale where before he is about a 2. Now, we need to improve the loss of muscle on his topline. Several people have suggested riding him and working him on hills, but there are no hills close to me. I live in Georgia. We have been working him a few laps a day in the round pen at a slow trot both ways on the lunge line, but was wondering what else would help improve his top line. Would it hurt to get him going over some cavaletti poles? Any suggestions?