Stand on the yoga mat with your feet together, shift your center of gravity to your left leg, then lift your right leg backward, lean forward parallel to the ground and keep balance, straighten your arms forward parallel, tighten your lower abdomen, maintain a correct posture, and take 3 to 5 soothing deep breaths. Stretch your abdominal muscles, your back, arms and shoulders, starting with the downward dog posture. Slowly lower your forearm to the ground, open your feet, keep your shoulders perpendicular to your elbows, keep your body as straight as possible, keep the correct posture and breathe slowly.