Overweight decreases because it causes a negative caloric balance, forcing the body to take the fuel to the energy reserve of the body fat. The way you can speed up the caloric expenditure is making systematic and regular physical exercise, or increase the level of movement throughout the day doing activities that involve somehow a physical effort, as proposed Effect NEAT.
The best exercises to burn extra calories are those using the large muscle groups of buttocks, back, chest and legs, as aerobic activity (rowing, cycling, skiing, swimming, skating, running, etc.), or weightlifting with exercises like Chin, Lunge, Squat, Bench press, etc.
It is also effective to a lesser extent, because they burn fewer calories, and Pilates exercises thermionic activity not associated with physical underwriting year (NEAT) which are all systematic activities within a day, involving some degree of physical effort, like climbing dancing, walking to catch the bus, stairs, do carpentry tasks, gardening, spending more time standing, among others.
So, aware and determined attitude of trying to move on any given occasion, and increases the metabolic rate and efficiency of the body to burn fat. Finally, remember that as you get closer to your ideal weight, the same will decline slowing to find the equilibrium level.