I do not find this to be an easy topic to write about because there is SO MUCH variability in what a correct galloping position should be. It takes time and years of practice to perfect. It is not easy, but is absolutely something that must be worked on and practiced, and muscle memory is key to success.
We feed our horses for optimal performance, spend countless hours practicing all aspects of the dressage test to get the lowest score possible, we do grids, we do trot, canter, and gallop sets, then place the best quality shoes and boots on our horses to protect their legs. We do all of this, yet when it comes to rider fitness few riders treat themselves like the athletes they are.
This year the governing body of equestrian sports, the Fédération Equestre Internationale (FEI), is going to increase testing of the human athletes in preparation for the 2018 FEI World Equestrian Games in Tryon, North Carolina. While the well-being of the horses is always top priority, and it is well established what a controlled substance is for a horse, the same rules are not as well understood for riders.