Join Date: Dec 2010
Location: southern Arizona
At the beginning beginner level, much remains the same - particularly with a dressage seat. There are more differences with a jump seat. Heels under hip is stressed less, and many kids ride too large saddles that make it hard to have the heels back anyways (I'm thinking my youngest daughter, who weighs 85 lbs but rides a 16" saddle because that is what we have).
My daughter in law is older, but she was taught sitting the trot in her first lesson. From observing, I'd say there is more emphasis on being able to stop the horse quickly and completely, and more emphasis on having fun while on the horse. I took some group lessons in my teens. IIRC, the second half of the first lesson was on a trail. Looking back, I don't agree with it, but that was how it was done then.