While it might often be spoken about in artistic, aesthetic, or even philosophical ways, lightness — both of movement and also of communication with horses — is more than an abstract ideal. In many ways, it measures a horse’s current physiological capabilities.

A closer look at the troubling physiology behind this common practice and how to support curiosity and courage in our horses instead.

A hot humid day. One rider. One horse. Both are exercising at a moderate level. Who is more likely to overheat? It might surprise you to learn that your horse gets hotter much faster than you and is more susceptible to the negative effects of heat stress. Prof. Michael Lindinger, an animal and exercise physiologist at the University of Guelph, explains: “It only takes 17 minutes of moderate intensity exercise in hot, humid weather to raise a horse’s temperature to dangerous levels. That’s three to ten times faster than in humans. Horses feel the heat much worse than we do.”

A daily anxiety for many owners of senior horses is that there may be little time left for the riding and activities they have enjoyed until now. As a horse approaches and then passes the age of 20, good rides start to feel numbered. The swayback, gait irregularities, lack of energy… these outcomes seem to be only a matter of time. And without clear reason to do so, many owners start backing off, easing the horse into retirement. Ironically, this approach usually hastens a horse’s decline instead of delaying it.