90% depends on how you do it. You must finish a group of 30 tens, rest for one minute, and do three groups in a row to get the effect. If you are not used to it on the first day, you must stick to it for 3 4 days, get used to it for one month, lose fat for two months, and the effect will be three months. Remember not to fill 90 abdominal muscles a day, it's useless ~