Listen to Hot Cross Buns. Memorize it. Sing it with the recording and without. March in place as you sing it. If you can't march with your legs, use your hands or two fingers or your two big toes. It doesn't matter how you do it as long as you get the feel of the steady beat.
Just for fun watch this YouTube of a flash mob in the Antwerp train station dancing to "Do, Re, Mi" from The Sound of Music. It is quite impressive.
