Relax on stomach. Arms folded. Wide legs. Roll feet so heels point in. Press pelvis into floor. Rest forehead on arms. Feel stomach gently press into the floor on the inhale, and gently pull slightly away from the floor on the exhale.
Prone breathing has the added benefit of bringing attention to your breathing. On each inhale and exhale you will feel your stomach interacting with the ground. Feel your stomach gently press into the floor on the inhale, and gently pull slightly away from the floor on the exhale.