09/25/2026
The Diagonal Core: Connecting the Pelvis to the Ribcage
In the last blog, we looked at how the rider’s body doesn’t function in straight lines. It works through diagonal and rotational connections, with one area constantly influencing another.
Now let’s look more closely at one of those connections.
Think about a diagonal relationship beginning around one side of the pelvis and pelvic floor and continuing upward through the trunk toward the opposite side of the ribcage and spine.
Why does this matter to a rider?
Because the pelvis and ribcage cannot function independently of each other.
If the pelvis becomes unstable, the upper body often compensates. The ribs may shift or extend, a shoulder may become overly mobile, or the rider may begin using the arms and legs to create the stability that is missing through the center.
The opposite can happen as well. If the ribcage collapses, rotates excessively, or becomes rigid, it changes what is happening underneath it—including the organization of the pelvis.
One affects the other.
This is where the idea of a diagonal core becomes useful.
Instead of thinking about “engaging the core” by tightening the abdominals, think about creating support through these deeper connections.
The goal isn’t to lock the pelvis to the ribcage. It is to create enough connection between them that they can move independently without becoming disconnected.
That is a very different kind of stability.
For the rider, this becomes particularly important because our aids rarely happen in perfectly symmetrical patterns. We are constantly managing different forces on the two sides of the horse while maintaining our own balance over the center.
Think about riding a shoulder-in.
Your inside leg is asking the horse to step underneath and create bend, while your outside rein and outside side of the body help organize and contain that movement.
To do that effectively, your own pelvis and ribcage need to stay connected.
If your ribcage collapses to the inside while your pelvis shifts to the outside, that diagonal connection through your body is lost. Instead of the pelvis and ribcage supporting one another across the diagonal, they begin moving as disconnected pieces.
Now the arms and legs have to compensate.
You may pull on the inside rein, push harder with the inside leg, or brace through the outside arm—not necessarily because the horse needs a stronger aid, but because your body is trying to create stability somewhere else.
This is exactly why connecting the pelvis to the ribcage matters.
When that diagonal connection is organized, you can keep your pelvis responsive to the horse while the opposite side of the ribcage provides support above it. The two areas are connected, but neither one has to become rigid.
Your arms and legs are then freer to give an aid rather than being used to hold you in position.
That is the diagonal core in action.
It isn’t about holding the pelvis and ribcage still.
It is about connecting them well enough that they can move together—and independently—without losing the organization of the rider in between.
Equibalance Method
equibalancemethod.com
