Imagine that you cut the bridle off, but the reins remain: Your arms should continue to follow the horse’s mouth to keep the bit positioned correctly. You don’t want to hold the bit tightly in your horse’s mouth nor do you want to let it fall out. —Allison Brock

Allison Brock is the head trainer at Deer Meadow Farms. She was the reserve Grand Prix rider for the U.S. team at the Pan American Games in 2015, and part of the bronze-medal dressage team at the 2016 Rio Olympic Games. Currently, she is the equestrian representative for the Athlete Advisory Council, which works with the U.S Olympic Committee. Brock is based in Wellington, Florida, and Keswick, Virginia.