This article is going to show how u can do weight watchers for free, but first off, lets see why weight watchers is so successful. The 4 pillars of success; Food, exercise, behavior & support.
1 Hip muscles. Lunges work all of the gluteal muscles in the hips, primarily the gluteus maximus that is used to extend your hips. Taking large steps during a lunge can further engage this muscle. The gluteus minimus and gluteus medius are also used to stabilize your body throughout the lunge.  Thigh muscles.
Split squats and lunges are both lower body exercises that focus on the gluteal muscles that make up your bottom as well as the fronts and backs of your thighs, the quadriceps and hamstrings. In addition, both exercises work the calf muscles and core.