Humans can inflate balloons with their ears.
There are a few different ways to blow up a balloon and the most common and easy way is to use your mouth.
Another popular method is to use a pump. This can either be a hand pump or an electric pump.
There are also some less common methods, such as using a compressed air canister. These can be very effective, but they are also more dangerous as they can cause the balloon to explode if not used properly.