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.
Lunge jumps rely more on thigh and hip strength than they do calf strength; however, these relatively small but powerful muscles still have a part to play. Your larger calf muscle, the gastrocnemius, crosses the back of your knee and ankle joint and is involved in extending your ankle as well as flexing your knee.