Can kickboxing make my legs look slim and toned like pro boxer?

Diet with exercise: Spot exercise doesn't do much for improving a lean appearance. A healthy diet with reduced caloric intake is first and foremost for achieving that goal. Whole body exercise can accelerate the process. Kick boxing if done with intensity can certainly help to increase your base metabolic rate and thereby, your caloric expenditure but it won't work if you eat more than you burn.