You see, as you twist a balloon, you effectively tighten the balloon and reduce the amount of space inside to hold the air. Here are tips on inflating a balloon for twisting and animal balloons.
As you pump the balloon, you'll need to keep proportions in mind. All of the instructions on making balloon animals talk about something that balloon artists refer to as the "tip," the uninflated portion of a balloon that's left after you tie the balloon in preparation for twisting. The picture shows the uninflated portion of the balloon.
Generally, the more complex the balloon, the more segments that you will twist into the final balloon animal. And, as a result, the more "tip" or uninflated portion of the balloon you will have to start with.
With the instructions on making balloon animals, you’ll notice that each recommends a portion of the balloon that should remain uninflated and most show a picture of this recommended length.
Ideally, the balloon will come out "even" after twisting. By allowing an appropriate amount of uninflated balloon or "tip," your twisting will result in an even balloon.
Leave too much "tip," and the final balloon will have an uninflated portion when you're done. For example, if you're making a dog, the tail will have a small portion of balloon that hasn't been filled out.
On the other hand, leave too little "tip," and you won't be able to finish the balloon. The balloon will become too "tight" and you won't be able to twist the final portions because you've run out of space for the air. This will make more sense as you experiment and twist balloons.
Finally, one more tip is to "burp" the balloon before tying it. After inflating a balloon to its desired distance and leaving the recommended "tip," it's usually a good idea to let out a little air, or "burp" it. All it takes is a short burst of air. This softens the balloon a bit so it's easier to twist, reduces the stresses on the balloon and makes it less likely to pop.
Keep these inflation tips in mind and you'll be on your way to successful balloon twisting and animal balloons.