Hi. I have been riding about 3 years, and about 8 months ago, I started getting into jumping. I was looking at tack, and found breasts plates and martingales. I always thought breast plates were used to control the horse's head when jumping. But, I saw a martingale does the same thing. Can someone please help me understand what the difference is and what kind of correct breast plate or martingale you are supposed to use for show jumping.