I needed an inner thigh workout that could allow me to still be lazy. ;) It works really well on the arms and chest also. I can feel this working. I know if used regularly with diet and other exercise I will see results. Even without those things I believe I will see some toning at the least. I’m 5’3 160 lbs. I do 3 sets of 60 reps. I saw someone else mention these numbers and agreed these would be the numbers that would create results. I literally lay there and watch Netflix or do homework while doing this. I have had no issues with what has been mentioned in the comments. This is other than the squeaky sound it makes. I recommend using in private lol it’s a little awkward, but what workout isn’t?