Zero Brace

Pat Parelli says "Zero brace means simply that there is no tension or stiffness in his body from worry or resistance when he responds. This means your horse is not braced mentally, emotionally, or physically. " 
I have  heard this over and over during my learning but I never really realized what it really meant til just now and I can see the brace my horses have. I see the "I don't want to's in my everyday communication with them. I need to work on this more and eliminate as much brace as I can to achieve better harmony with the girls and Tucker. Tucker showed me his brace starting with his unwillingness to come in from the field with me. Now he shows me how he does not want me to touch his mouth or ask him to put the bit in. All these little things that he tells me we need to work on so we can be in better harmony and work toward zero brace.