Body inflation

Some people said that they had a lot of success with this method, but for me it's nearly impossible to retain anything and I can only do it for a few seconds before it all comes leaking out.

Find something that fits well, many different enema "probes"😂 warm water with slow flow rate. I've had good luck fasting before. Also helps to do a half effort inflation and just let that go for however long feels right and then go for the gold.