The first and most essential part of Martial Arts, Especially aikido, is the cultivation of a calm state of mind. Without this aspect incorporated into your training you will merely be doing physical activity. Connecting the Body-Mind through meditation is the true path of Aikido. If you cannot go into the silence of the mind during sitting Meditation, how can you expect to be able to perform the right technique at just the right time to protect yourself or others?
At it highest level Aikido is Meditation in Motion. Here I have an excellent link to my page if you are interested in Meditation and if you want to practice whether you are a Martial Artist practitioner or somebody who wants to experience a new inner world.