No pictures, but in October of 2010, we rescued 2 TWH's, a 14 yo mare with a body condition score of a low 3 and a 4 yo gelding with a body condition score of 1. He was not expected to live through the winter, but 5 dedicated vets put their heads together along with ours and we came up with a feeding plan that would push him to gain weight at an almost unheard rate once the danger of refeeding syndrome passed. He was on the maximum amount of Senior Feed for his ideal weight per the feed tag split into 3 feedings, 1 cup of Calf Manna once a day, free choice grass hay with limited fed alfalfa hay, and 24/7 pasture with free access to his stall so he had a herd to play with and teach him how to be a horse (He'd been trained on pads as a Big Lick show horse and never been on pasture or with another horse after weaning). He thrived and gained 500 lbs in 5 months and grew 4 inches!
Muscling for him was partially been on pasture where he could self exercise until he was his ideal weight and cleared for riding. It took about a year of conditioning him under saddle to build his muscles, especially his hindquarters and top line. His conditioning program was 2 fold----arena work to develop flexion and learn shoulder in, haunches in, side pass, working on spirals, serpentines, and circle, transitions between gaits and changes of direction, etc. The other part was long trail rides, gradually increasing distance, speed, steepness of hills, and time as his TPR indicated he was ready for. Today, now a 10 yo, he's hubby's trail horse, roping horse, and just have fun horse!