How to do simple abs exercises？

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In response to the problem that more and more white-collar workers are troubled by sub-health, Xu Yang, a professional fitness coach of Comfort Castle, told the secret of office white-collar fitness. For the office family, he suggested the following method: open your legs naturally, stretch your arms straight up and raise your back swing, then lift your chest and waist up, take a deep breath, and lengthen your shoulders, back, and waist muscles. Hold still for 3-5 seconds, then slowly stand upright and exhale. Sit upright, straighten your legs and lift them forward, hold for 3-5 seconds, then bend your knees to your chest, and repeat this cycle, doing 15-20 sets at a time. This action mainly relies on the strength of the abdomen. Do not hold your breath during the operation, and maintain smooth and rhythmic breathing. Use the desk as a workout facility. Put your hands on the edge of the table, straighten your legs together, and form an oblique angle with the table. Then, bend your arms and elbows to lower your body, put your weight on your arms, and use your arms and legs to support them. Strength to prop up the body, 15-20 times in a row.