The biggest reason that most inflatable paddle boards are unstable is because they are not inflated to the proper PSI. Most paddleboards need between 10-20 PSI (it's typically written on the valve). This is A LOT more pressure than most people think their paddleboard needs. IT should have almost no give when you push on it. To make sure that your board has the proper pressure, a paddle board pump with a pressure gauge is absolutely necessary.