[QUOTE=Corporal;2105297]You and the horse look pretty good. Your feet are pumping a little bit at the posting trot, so you can work on your leg strength. It just shows some muscle weakness, and I see you have weight in your stirrups. Spend time in a 1/2 seat and riding without stirrups, and especially riding LONG PERIODS without stirrups and your legs will be too tired to push you out of the saddle.
I have a bigtime problem with this; feet pumping, especially my right leg. I never ride without stirrups because I am a wimp and scared to fall off the 17 hh horse.