A well-trained horse is a safe (er!) horse
I cannot promise you a horse that doesn't react!
I can promise you:
AN ASSESSMENT OF COMMUNICATION
Looking at how clear your horse finds what is being asked. Any confusion can lead to problem behaviour.
A range of tools give YOU the know-how to add what your horse needs in a current situation. Having flexibility is great here - not trying what you've always done, but being able to try a technique that's been proven through evidence to work for horses (see What is Equitation Science). If it doesn't work, you have more tools up your sleeve.
It's of the upmost priority to ensure your horse feels as positive as it can when they are with you. We do a lot with our horses that arguably they wouldn't do if they had a choice. It is up to us to make this as pleasant as possible.
STEPS TO MOVE FORWARD (literally!)
Looking at the basics is always they way to discover the root of any problems with our horses. Taking out emotion as the reason (aka "he's being deliberately naughty") and being able to say "ah yes, my horse doesn't know what stop means" gives us a direction point to improve training. Combining this with clarity of communication and you will have a safer horse. See below for more on Basic Responses...
There are basic responses the horse needs
TURN THE HINDQUARTERS
These responses are further broken down into