Find a quiet place where you can stay undisturbed for a short time. Either lie on your back (e.g. on a mat) or take a relaxed sitting position (e.g. on the sofa, cross-legged on a mat, etc.). Try to relax your whole body by sinking even deeper into the mat or the floor. If you like, close your eyes or, alternatively, fixate on a point on the floor or ceiling so that you can be completely at one with yourself.
Take a few deep breaths and then consciously concentrate on your breathing. Focus on how your breath flows in and out.
And then try to notice where in your body you can feel your breathing most strongly. Perhaps it is your abdominal wall that rises and falls with every breath. Perhaps you can feel how your chest expands and contracts with every inhalation and exhalation. Or how the air flows in and out through your nostrils.
Concentrate fully on your breathing and allow yourself to sink further and further into relaxation. And you can realise that you can also use this form of breathing meditation in everyday life at any time.
And when you are ready, slowly come back into the room. Move your hands and feet a little. Stretch and and open your eyes.