Buddhism teaches that the mind and the body cannot be understood independently of one another. This means that as well as cultivating the mind through meditation, the physical dimension of being is also very important. So as well as teaching meditation, many Triratna centres also teach classes in yoga, and some hold classes or retreats in tai chi, Aikido, and karate. Although these are not part of the core curriculum of centres, many people find huge benefits from practising such physical trainings with experienced teachers.
Look for your local Triratna Centre to see if it offers classes like these.
Learn how to do some basic breath and body work with this free guided introduction by Paramananda, from his bestselling book Change Your Mind.
Listen to a body scan meditation by Vidyamala.