My best friend was trying to lose 60 pounds after pregnancy...she had been trying for almost 8 years! Lost 20 pounds after the 90-day diet, but then restored everything lost, with some extra pounds on top of her previous ones..pretty disappointing
Last time I saw her she had lost 40 of those..could not recognize her! She got an online program including diet + exercise from Emily Skye. This is the website
https://www.emilyskye.com/ I have no info on which program she followed but..after 8 years trying whatever not, obviously this worked for her
she has 2 small kids so preferred working out at home, not at the gym. But suppose if you can afford the time to go to the gym - that would be more efficient I suppose
Good luck!