Hi, I just joined a gym and I'm just starting out with the weight lifting and cardio. My goal is to lose weight. At the gym I'm at now, the trainer told me I should be doing 1 set of 18 reps, slowly. She said I could build up to 2 sets, but I would have to make sure to give the muscle a good amount of rest in between sets. But I have also been told that to lose fat, I should be doing a few sets back to back at a faster pace. What do you think?