Niwali Keto The practice was very well-known in the Victorian times but has been something that has come back by well-known demand. The oldies used leather and lace corsets with over 24 steel bones, that ultimately restrain your stomach ridiculously. A stomach cincher is actually the Twenty first century version of a stomach corset. Now you may ask, is stomach coaching safe? Let's look at good and bad points. Pros vs Cons Pros: • Instantly reduces stomach by 4 inches. • Has thermal areas on it to increase sweating on your core area. • Helps position and coming back.