Cycling is a good yoga exercise to exercise the abdominal core, and it will have a good effect if you insist on practicing. It is important to pay attention to the practice of drawing the largest circle on both legs, and at the same time pay attention to sticking the lower back on the mat (looking for the Yamagata essentials in yoga) and tightening the abdomen. If you feel pain in your back at the beginning of exercise, you can put your palm under your hips first. The point is persistence. Pay attention to mobilizing abdominal muscles.