Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns..
As per your complain it seems that 
belching or burping is an act of passing gases that are formed in intestines..
Gas formation is a normal phenomena but when it is formed in excess there is excess of belching or burping and can also be causing flatulance..
It can occur due to number of causes like Intake of certain foods,Eating too fast that can entrap excess of air,
Lactose intolerance, excess intake of dairy,Diseases like Crohn's Disease,Bacterial infection in intestines, 
Constipation,Frequent chewing of chewing gums and sucking candies,Excess intake of dairy etc..
As it is a chronic cause you need to 
consult a Gastroenterologist and get a thorough evaluation done and he can advise you investigations like 
Endoscopy, blood tests, stool culture etc to confirm the diagnosis and treatment of the cause can resolve the problem..
-As you are doing regular workouts it is a good practice..
-You should also take walk after meals..
-You should take small portions of food every 2 hours.
-Avoid heavy and large fatty meals..
-You should also limit intake of frizzy drinks, smoking and excess chewing gums..
-You can take 
Simethicone as it help in reducing intestinal gas..
-Activated 
charcoal pills can be helpful..
-Drink sufficient water..
-chew your food slowly and properly..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora..