It must be fitness. Yoga is mainly about practicing flexibility, relaxing body and mind, relieving fatigue and stress, not tightening your stomach. You can often see a group of chubby people in the yoga room of the gym, but you have to combine equipment with aerobic exercise to get better fitness results. Remember not to fish for three days and dry the net for two days, which is basically ineffective. Fitness is expensive. If you have any questions, you can continue to ask, or consult the coach there and the current fitness situation.