If you simply want to increase your waistline, you must first supplement nutrition, eat more and eat well. But if you want to make your waist stronger, you must increase the training of waist and abdomen strength, and you can do sit-ups or parallel bars exercises. This has a very obvious effect, and at the same time, it can enhance the quantity and quality of muscle fibers in your waist and abdomen. This is called a squat waist, not a beer belly and a bucket waist.