While meditating I sometimes feel that my body is moving rhythmically, but when I open my eyes I see that I am not moving at all.
The movement you feel is in the inner world, in your subtle body. That reality has not yet manifested itself in the physical, nor does it need to. If you feel that you are flying while you are meditating, you do not have to manifest this movement in the physical.
But if you feel abundant peace within you, then you should immediately try to manifest it in your eyes, in your physical consciousness. Here on earth very few people have peace. When you bring peace into the outer world and manifest it, you are solving the problems of the entire world. The world needs peace, the world needs love, the world needs all divine qualities. Your goal is to see and feel peace, light and bliss, and bring them to the fore in your outer life. By manifesting these divine qualities, you can serve mankind and fulfil God.