Kathy and Ringo warming up in the walk 

You will hear "The walk is the queen of all gaits" if you hang around the French tradition of légèreté for any length of time. In the walk, both the rider and the horse have time to get organized, make changes of weight and balance, and adjust the aids and the responses to the aids, all while strengthening the horse and improving their balance. Lateral movements at the walk resemble tai chi or yoga, neither of which are easy and both are physically and mentally very profitable.
Kathy and her Mustang gelding Ringo are showing us the basic movements of shoulder-in, travers, and half-pass in the walk. The flexion, weighting of the shoulders, and position of the haunches are all adjusted separately to achieve these moving balance/strength exercises. Perfection isn't a requirement. We are working toward communication that encompasses all kinds of separate balance and movements with the horse/rider team.
People ask, "What are you working on?"
The bedrock for anything and everything.