Belly inflation or inflation is done by inserting a hose or a air tube up your butt into your asshole and forcing air Or water into yourself until you belly expands.

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Usually, belly inflation is done one of two different ways.
The two ways are:
Via Air
Vie Water Enema
first we will talk about air inflation.
The person that wishes to inflate her belly first gets a device capable of pumping air. Such things can be a bicycle pump or an aquarium pump. These items are perfect, for they both can pump air, and have long hoses for easy inflation. Then the hose is inserted three to for inches up the anus to insure that no air escapes, this is done by perhaps lubing the hose with vasoline. Air is then slowly forced into the rectum and then into the colon. This air rises, and pushes on all the walls of the colon. This pressure builds, and pushes the belly outward. Often during first time inflations, little to no change can be seen. but after practice, an expansion of over 40 inches waist can be achieved. Air is then let out naturally.

For water inflation.
The most common way to do a water inflation is in the shower. Most showers come with separate heads located on long hoses. These heads can be removed and the hose nozzle is then inserted into her anus. Then, with small amounts of pressure, the same process of slowly inflating begins to push the belly out. Often, by practicing, larger belly expansion is achieved. In fact, most girls tend to turn up the pressure to a higher force, this can really really push the belly out and make lots of pressure. This plumpness from the water is the best type of inflation. From two years of experience, over 8 gallons of water can be held for over 10 minutes, making a soft, pale, and stretched belly. such roundness is quite choice.