It is important to know what effect training should have on your horse. Preparatory work in hand and on the lunge strengthens the correct muscles in the hose’s body so that he can carry a rider with ease. This also depends ultimately on the rider’s ability and posture, but that is another subject. As a comparison, a 600kg horse ridden by a 60kg rider is working carrying 10% of his body weight. This is equivalent to a 60kg person working out with dumbbells totalling 6kg.in weight.