Yoga uses the body, breath and mind to help establish stability, health, strength and balance. This can start on the yoga mat, but it's reach goes beyond into life with regular practice. It could be considered a form of meditation in action. A moving meditation as you practice yoga, focusing the mind on the breath and body. If you find a sitting meditation hard, perhaps a moving meditation might be a good starting point.
For an interesting overview on Yoga as a moving meditation, I came across this article which provides a nice overview beyond the bodywork that we often see in yoga classes. Read more... Yoga, a moving meditation?