In the Beginning...
Your horse accepts what you're asking because you're not forcing.
I show him a target (something harmless he must touch with his nose). He touches it, hears a "click" & receives a treat. Repeat until he knows he'll be rewarded for correct responses. Now, he's curious, willing, & relaxed. He's curious instead of fearful of new things.
Learning turns into a game.
Building Riding Muscles
Horses naturally carry themselves with a hollow back. For riding, their backs must be lifted. Simple exercises (pictured) teach the horse to lift & strengthen.
Think Pilates for Horses.
The horse learns to shift his weight to his stronger hindquarters & is what's called "balanced."
A balanced horse is an easy ride. A safe ride.
Every rein cue your horse needs to know done on the ground first.
HOW he moves forward, backs up, turns left/right is the key.
Hind legs stepping under the belly, lifts the back, lowers the head, & helps the horse carry the rider properly, comfortably. Safely.