Join Date: Dec 2010
Location: southern Arizona
You can't sit the trot by conscious effort. Your mind isn't going to help you. Get in position, then relax.
Weight in your heels does NOT mean you force your heels down, or feel a lot of weight in your stirrups. It means you relax your leg, and don't grip with it anywhere as it drapes your horse. Don't grip with your thighs, don't grip with your knees, and do not brace in the stirrups. If you give it any conscious thought, let it be to spread your knees farther apart, and to relax all the muscles in your leg.
How much work do your legs do when you 'sit the chair'? When you 'sit the couch'? Let them do that much work when you sit the trot.
Although it takes core strength in your abs, it is not strength you can apply with your conscious mind. The beat is too quick. So stop trying. Sing, talk, and give it no thought other than to relax your legs and spread your knees apart.
You will bounce some, but your SUBCONSCIOUS mind will adapt to the horse's movement.
My daughter-in-law is very flexible, and she sat the trot her first lesson. No one told her it was hard. She was too busy laughing and smiling to care about a bit of bounce. Although we later had to tell her to straighten her back some, she was sitting the trot quite well after 30 minutes of riding.
A horse who will do a slow trot makes it easier. You will bounce more on some horses and at some speeds than others. Don't worry about it. You can work on slowing your horse and getting a gentler motion once you learn to relax and minimize the bounce.
All that is IMHO. I'm not a trainer or a teacher, and I don't do WP. But I spent a lot of time TRYING to sit the trot, then succeeded in one riding session - when I stop trying so hard.
"People can teach us the rules, but only horses can teach us the art of riding."