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.
How To Stretch The Hip Flexors. The most common way to stretch those hip flexors is the lunge. However, there are a few other ways to get at this muscle group. The standing lunge and two other possibilities are detailed in the video by Deborah Vogel (The Body Series) below.