The Target: Your thighs, hips and abs
Stand holding a dumbbell in your left hand next to your shoulder, with your arm bent [A]. With your right foot, step backward into a reverse lunge and lower your body until your back knee almost touches the floor [B]. Push yourself back to the starting position and repeat until you've done all your reps.
If that's too hard: Do the same movement, but without the weight. (You can place your hands on your hips.)