Many of us are aware of the effects that mounting from the ground can have on a horse’s back, but did you know that it can cause your saddle’s tree to twist? According to Master Saddler Michael Dainton, mounting from the ground is one of the #1 causes of twisted trees. And understanding the mechanics of mounting is important to ensuring the health of your horse and your tack.
The act of mounting from the ground requires the rider to literally defy gravity, and according to Jeff Thomason, associate professior of biomechanical science at the Ontario Veterinary College in Guelph, Canada, the force that the rider exerts in ground mounting doubles the rider’s weight in the stirrup! This results in the saddle being jerked down and toward the rider, causing discomfort for the horse, and, over time, damage to your saddle’s tree. And the farther away the rider is from the horse in height, the more torque (or twisting) the horse experiences. Considering how tightly girthed our saddles have to be in order to mount without ending up underneath the horse, you can imagine how painful it must be to be jerked around like that.
Since horses are built more longitudinally stable (their fairly long backs coupled with feet close together), mounting from the ground inevitably displaces the horse’s position and throws him off balance. The pull of the saddle forces the horse to shift his weight to the left legs, thus causing imbalance to the right. To compensate for this, the horse must then raise his back on the left side, and, coupling this with the rider’s grasp on the reins, the horse is unable to rebalance himself using his head and neck as a counterweight.
As the rider mounts the horse, the panels of the saddle press against the horse’s spine especially at the withers and digs into the muscles on the near side. Over time, this regular jarring can have a devastating effect on the health of the horse’s back. For a horse with chronic back pain, this could mean a greater chance of injury, and, at the very least, an undermining of his chiropractor’s hard work! A fascinating article on the subject, written by Karen Smith and found at http://equisearch.com/horses_care/health/anatomy/ease_mounting_pressures_021009/, discusses studies done on the effects of ground mounting on the horse.
Mounting from the ground actually puts the rider at risk, as a horse’s discomfort can lead to misbehavior that can cause the rider to become off-balanced. According to Doris Bixby Hammett, MD of the AMA, the first 15 minutes of riding (including mounting time) is when the rider is most susceptible to injury, including muscle and tendon strains to concussions from being dragged or tossed off by a misbehaving horse. Using a mounting block whenever possible will lessen the odds of a mounting-related injury, as there is less strain to the rider as well.
Using a mounting block will provide less strain on the horse, the rider, and the saddle. Stirrup leathers will last much longer (although you still will want to rotate them regularly to avoid uneven stretching), and your saddle’s tree will definitely experience greater longevity, as there is significantly less torque applied when mounting from a block. Considering that a saddle is pretty much useless if the tree has been compromised, it may be considered wise to prevent harm to the tree whenever possible.
Of course some riders will say that they’re not always around a mounting block (like on the trails, for example). Occasional ground mounting may be necessary, but if your horse will allow you to mount from, say a log on the ground or a strong fence rail, you might want to consider doing so (safely, of course).











