You can do something as simple as a cold ice pack on your upper back and your upper chest for 30 minutes when you watch tv at night. Then you can build up to taking a cold shower the next morning. the final step, is to take an actual Ice Bath up to your waist for 10 minutes, three times per week. But take it slowly – you should not go from doing nothing straight into an Ice Bath.
When you are cold, your body has to do a lot more work to do the same things as when it is warm – so you burn much more fat. You have something called Brown Fat that is located around blood vessels and keeps your blood warm. By cooling off with ice, your body is forced to burn a dramatically larger number of calories. I have heard that sucking on ice cubes or drinking cold water also helps you to lose weight because your body has to use energy to bring the cold water or ice up to your body’s temperature. Sounds like a similar phenomenon!