While it is true that increased weight exaggerates motion, the cost of that added motion is fatigue. Fatigue is due to the increased energy required to put that weight into motion. Horses with heavier shoeing packages work harder than those shod light; it is as simple as that. There is no better support to this point than the fact that so many trainers elect to race barefooted in big races, especially in second-heat races. A few special horses gait better with added weight and overcome the fatigue factor to win. Donato Hanover was a great example of this.