Inside leg is one of the foundational concepts in rider aids and equitation. It refers to the rider’s leg on the inside of a circle, bend, or movement — the leg that corresponds to the direction the horse is travelling or bending toward. In practice, the inside leg has two primary functions: generating impulsion and maintaining bend. Understanding how to use the inside leg correctly is central to developing an independent, effective seat and to producing correct lateral work, transitions, and collection.
The Role of the Inside Leg
The inside leg is applied at the girth — the position directly beneath the rider’s hip when the seat is neutral and balanced. Its primary purpose is to maintain or create energy: it asks the horse’s inside hind leg to step forward and under the body, generating impulsion and engagement. Without the inside leg driving the horse forward into the outside rein, work on circles and in movements becomes flat, lacking power and expression.
The inside leg also maintains bend. On a circle, the horse should arc gently around the inside leg, bending uniformly from poll to tail in the direction of travel. The inside leg keeps the horse’s ribcage from collapsing inward and prevents the horse from falling through the inside shoulder. This is why the common instruction “inside leg to outside rein” is so central to riding — the inside leg creates energy and bend; the outside rein receives and contains it.
Inside Leg vs Outside Leg
The inside and outside leg work as a complementary pair. The inside leg at the girth creates impulsion and bend; the outside leg slightly behind the girth controls the quarters, prevents the hindquarters from swinging out, and in canter, asks for the outside hind to strike off on the correct lead. A rider using only the inside leg without the outside leg in place will find the horse’s quarters drifting outward and the movement losing balance. Both legs must be quietly active — “on” without nagging — to maintain an even, balanced horse.
Common Errors
The most frequent mistake is gripping with the inside knee and thigh rather than applying the lower leg. This tips the rider off their seat bone, collapses the inside hip, and paradoxically pushes the horse outward rather than bending it inward. The inside leg aid should come from a long, released lower leg pressing inward at the girth, not from a braced knee.
Another common error is drawing the inside leg back — behind the girth position — when asking for bend. This confuses the horse, as the leg behind the girth is the signal to move the quarters, not to create bend. Keep the inside leg at the girth and allow the lower leg to hang naturally.
Application in Key Movements
The inside leg is essential in circles, lateral movements, and canter. In half pass, the inside leg maintains bend and impulsion while the outside leg generates the sideways movement. In shoulder-in, the inside leg creates the bend and drives the inside hind under the body. In canter transitions, the inside leg supports the strike-off while the outside leg asks for it. For an overview of position and aids, see Equitation. For related lateral work, see Diagonals.
Frequently Asked Questions
Why does my horse fall in on circles despite my inside leg?
Falling in is usually a combination of the horse leaning on the inside shoulder and the rider inadvertently collapsing their inside hip, which reduces the effectiveness of the inside leg. Check your position: sit equally on both seat bones, keep your inside hip open, and ensure your inside leg hangs long rather than gripping. Try an upward transition to re-engage the hindquarters, then re-establish the circle. A shoulder-fore position — bringing the horse’s forehand very slightly to the inside — can also help counteract falling in.
How much pressure should I use with my inside leg?
Ideally, the leg should maintain a light, consistent contact with the horse’s side rather than rhythmically kicking or squeezing. A horse trained to a light leg aid should respond to a brief, clear signal and then maintain the pace or bend without constant reminders. If you find yourself constantly pushing, the horse may need more straightforward forward training — transitions and poles are effective for improving responsiveness to the leg.
Does inside leg change when I change direction?
Yes — inside leg is defined relative to the direction of travel, so when you change the rein, your inside leg becomes your outside leg and vice versa. This transition must be conscious and deliberate: as you turn across the diagonal or cross the centre line, think about repositioning both legs and your weight to support the new direction. Many riders develop a habitual dominant leg and forget to actively change — which is one reason horses can feel noticeably stiffer on one rein than the other.