Boxing is an excellent activity that will not only burn calories but will also allow you to relieve stress.
The reason why boxing is so effective is because you use your entire body. You use your legs to move around and you also use all the different structures in your upper body, especially your shoulders, in order to punch.
Interestingly, you also use your core to a very large degree in order to move around and throw punches effectively.
The key is to find a trainer that you are compatible with and make sure that you use a progressive program that allows you to continually increase the intensity of your boxing workouts. And do not forget the importance of working on your footwork so that you can burn even more calories and keep your lower body healthy and strong.
And do not underestimate the impact that a diet will have when combined with a solid boxing routine. Watching what you eat while doing boxing a couple times per week will really allow you to drop those pounds right in time for summer.
Just stick to the basics and you will notice a significant change. Stay away from sugars and other types of junk food and try to eat healthy meals with lean protein and slow digesting carbohydrates.
As always, drink lots and lots of water.