Correcting pacing not desired in gaited horses

This is a 4 yr. old TW mare that paces. Not to terribly bad, but it's still pacing and pacing is not a good thing in any gaited horse breed. This is how I correct gaited horses that pace. Some get it quickly, and some don't. It just depends on how much they want to "work in a circle". As soon as they find out they have to work when they pace, they don't want to put in the energy to be bad anymore.