How do you extend your thumb?

The referenced material is about performing a magic trick to appear to extend your thumb. Therefore, the answer will be about how to do this trick.

The "Thumb Stretch" Magic Trick

The "thumb stretch" magic trick creates the illusion of extending your thumb. It involves sleight of hand and misdirection. Here's a breakdown:

1. The Setup: Conceal part of your thumb. The video mentions starting in a way to make it look convincing.
2. The Illusion: Manipulate your hands so it appears that the thumb stretches. The video description describes it as "fast motion."
3. The Reveal (Optional): The video emphasizes the importance of showing your thumbs back to normal at the end, further enhancing the illusion that the stretching was real.

Essentially, you're using hand movements to visually trick the audience. It's not about actually extending your thumb.