Thinness of thighs: it is best to use an elliptical machine. The resistance should not be too great, just moderate, and the time is 30-40 minutes. It's best to do this first when exercising in the gym. This equipment can also thin legs, hips and arms, but in the right way. This equipment is very good. Abdominal fat is best not to use equipment. Those are for muscle training. It is best to lie on the mat and ask the coach for some methods (specifically, the stomach is the most difficult part to practice, so it is best to ask the coach). The meat in the back is preferably a big bird, and this one is the best, and it can also lose its arm. You can't say you don't practice any muscles, but you can practice a little. There is no equipment that doesn't exercise any muscles, but what I told you is mainly thin. I am a senior fitness instructor, and I know this better, but I can't make it clear in some aspects, so please forgive me and hope to adopt it! thank you