Since the time that I have returned from my friends casino which also has a bar, restaurant and rooms for night stays, I have noticed that my pants are not getting zipped properly, as a result of an increase in the waist size. This is all the fault of the beer and enormous amounts of snacks that we used to consume while betting on games that I failed to realize its effect on my belly and waist. Now I am planning to join swimming to burn these calories I have gained. How many calories can I burn in a day by swimming?